diff --git a/src/src/Classes.ts b/src/src/Classes.ts
index 135cb74dd..59b8e56a1 100644
--- a/src/src/Classes.ts
+++ b/src/src/Classes.ts
@@ -594,7 +594,7 @@ export class ChannelMediaRelayConfiguration {
     /**
      * The information of the destination channel: [`ChannelMediaInfo`]{@link ChannelMediaInfo}. It contains the following members:
      * - `channelName`: The name of the destination channel.
-     * - `uid`: ID of the host in the destination channel. The value ranges from 0 to (232-1). To avoid UID conflicts, this uid must be different from any other UIDs in the destination channel. The default value is 0, which means the SDK generates a random UID.
+     * - `uid`: ID of the host in the destination channel. The value ranges from 0 to (2<sup>32</sup>-1). To avoid UID conflicts, this uid must be different from any other UIDs in the destination channel. The default value is 0, which means the SDK generates a random UID.
      * - `token`: The token for joining the source channel. It is generated with the `channelName` and `uid` you set in `destInfo`.
      *  - If you have not enabled the App Certificate, set this parameter as the default value null, which means the SDK applies the App ID.
      *  - If you have enabled the App Certificate, you must use the token generated with the `channelName` and `uid`, and the `uid` must be set as 0.
@@ -713,25 +713,34 @@ export class LiveInjectStreamConfig {
     videoFramerate?: VideoFrameRate
     /**
      * Video bitrate of the added stream to the live interactive streaming. The default value is 400 Kbps.
+     *
+     * **Note**
+     *
+     * The setting of the video bitrate is closely linked to the resolution. If you set the video bitrate beyond a reasonable range, the SDK sets it within a reasonable range instead.
      */
     videoBitrate?: number
     /**
      * Audio sample rate of the added stream to the live interactive streaming. The default value is 44100 Hz.
+     *
+     * **Note**
+     *
+     * We recommend you use the default value and not reset it.
      */
     audioSampleRate?: AudioSampleRateType
     /**
      * Audio bitrate of the added stream to the live interactive streaming. The default value is 48 Kbps.
+     *
+     * **Note**
+     *
+     * We recommend you use the default value and not reset it.
      */
     audioBitrate?: number
     /**
-     * Audio channels to be added to the live interactive streaming.
+     * Audio channels to add into the live streaming. The value ranges between 1 and 2. The default value is 1.
      *
-     * Agora recommends choosing 1 (mono), or 2 (stereo) audio channels. Special players are required if you choose 3, 4, or 5.
-     * - 1: (Default) Mono
-     * - 2: Stereo
-     * - 3: Three audio channels
-     * - 4: Four audio channels
-     * - 5: Five audio channels
+     * **Note**
+     *
+     * We recommend you use the default value and not reset it.
      */
     audioChannels?: AudioChannel
 
@@ -774,12 +783,16 @@ export class ChannelMediaOptions {
      * Determines whether to subscribe to audio streams when the user joins the channel.
      * - `true`: (Default) Subscribe.
      * - `false`: Do not subscribe.
+     *
+     * This member serves a similar function to the [`muteAllRemoteAudioStreams`]{@link RtcEngine.muteAllRemoteAudioStreams} method. After joining the channel, you can call the `muteAllRemoteAudioStreams` method to set whether to subscribe to audio streams in the channel.
      */
     autoSubscribeAudio: boolean
     /**
      * Determines whether to subscribe to video streams when the user joins the channel.
      * - `true`: (Default) Subscribe.
      * - `false`: Do not subscribe.
+     *
+     * This member serves a similar function to the [`muteAllRemoteVideoStreams`]{@link RtcEngine.muteAllRemoteVideoStreams} method. After joining the channel, you can call the `muteAllRemoteVideoStreams` method to set whether to subscribe to audio streams in the channel.
      */
     autoSubscribeVideo: boolean
 
@@ -790,10 +803,22 @@ export class ChannelMediaOptions {
 }
 
 /**
- * TODO(doc)
+ * Definition of `EncryptionConfig`.
+ *
+ * @since v3.1.2.
  */
 export class EncryptionConfig {
+    /**
+     * Encryption mode. The default encryption mode is `AES128XTS`. See [`EncryptionMode`]{@link EncryptionMode}.
+     */
     encryptionMode: EncryptionMode
+    /**
+     * Encryption key in string type.
+     *
+     * **Note**
+     *
+     * If you do not set an encryption key or set it as null, you cannot use the built-in encryption, and the SDK returns [`InvalidArgument(2)`]{@link ErrorCode.InvalidArgument}.
+     */
     encryptionKey: string
 
     constructor(encryptionMode: EncryptionMode, encryptionKey: string) {
@@ -860,6 +885,10 @@ export interface RtcStats {
     rxVideoKBitRate: number
     /**
      * The number of users in the channel.
+     * - `COMMUNICATION` profile: The number of users in the channel.
+     * - `LiveBroadcasting` profile:
+     *  - If the local user is an audience member: The number of users in the channel = The number of hosts in the channel + 1.
+     *  - If the local user is a host: The number of users in the channel = The number of hosts in the channel.
      */
     users: number
     /**
@@ -884,18 +913,33 @@ export interface RtcStats {
     cpuAppUsage: number
     /**
      * The round-trip time delay from the client to the local router.
+     *
+     * **Note**
+     * (iOS only) Since v3.1.2, this parameter is disabled by default. See [FAQ](https://docs.agora.io/en/faq/local_network_privacy) for details. If you need to enable this parameter, contact support@agora.io.
      */
     gatewayRtt: number
     /**
      * The memory usage ratio of the app (%).
+     *
+     * **Note**
+     *
+     * This value is for reference only. Due to system limitations, you may not get the value of this member.
      */
     memoryAppUsageRatio: number
     /**
      * The memory usage ratio of the system (%).
+     *
+     * **Note**
+     *
+     * This value is for reference only. Due to system limitations, you may not get the value of this member.
      */
     memoryTotalUsageRatio: number
     /**
      * The memory usage of the app (KB).
+     *
+     * **Note**
+     *
+     * This value is for reference only. Due to system limitations, you may not get the value of this member.
      */
     memoryAppUsageInKbytes: number
 }
@@ -914,6 +958,12 @@ export interface AudioVolumeInfo {
     volume: number
     /**
      * Voice activity status of the local user.
+     * - 0: The local user is not speaking.
+     * - 1: The local user is speaking.
+     *
+     * **Note**
+     * - The `vad` parameter cannot report the voice activity status of the remote users. In the remote users' callback, `vad` = 0.
+     * - Ensure that you set `report_vad(true)` in the [`enableAudioVolumeIndication`]{@link RtcEngine.enableAudioVolumeIndication} method to enable the voice activity detection of the local user.
      */
     vad: number
     /**
@@ -1001,9 +1051,9 @@ export interface LocalAudioStats {
      */
     sentBitrate: number
     /**
-     * @since 3.1.0
+     * The video packet loss rate (%) from the local client to the Agora edge server before applying the anti-packet loss strategies.
      *
-     * TODO(doc)
+     * @since v3.1.2.
      */
     txPacketLossRate: number
 }
@@ -1061,15 +1111,15 @@ export interface LocalVideoStats {
      */
     codecType: VideoCodecType
     /**
-     * @since 3.1.0
+     * The video packet loss rate (%) from the local client to the Agora edge server before applying the anti-packet loss strategies.
      *
-     * TODO(doc)
+     * @since v3.1.2.
      */
     txPacketLossRate: number,
     /**
-     * @since 3.1.0
+     * The capture frame rate (fps) of the local video.
      *
-     * TODO(doc)
+     * @since v3.1.2.
      */
     captureFrameRate: number,
 }
@@ -1123,9 +1173,10 @@ export interface RemoteAudioStats {
      */
     totalActiveTime: number
     /**
-     * @since 3.1.0
+     * The total active time (ms) of the remote audio stream after the remote user publish the audio stream.
+     *
+     * @since v3.1.2.
      *
-     * TODO(doc)
      */
     publishDuration: number
 }
@@ -1177,10 +1228,13 @@ export interface RemoteVideoStats {
     rxStreamType: VideoStreamType
     /**
      * The total freeze time (ms) of the remote video stream after the remote user joins the channel.
+     *
+     * In a video session where the frame rate is set to no less than 5 fps, video freeze occurs when the time interval between two adjacent
+     * renderable video frames is more than 500 ms.
      */
     totalFrozenTime: number
     /**
-     * The total video freeze time as a percentage (%) of the total time when the video is available.
+     * The total video freeze time (`totalFrozenTime`) as a percentage (%) of the total active time of the remote video stream (`totalActiveTime`).
      */
     frozenRate: number
     /**
@@ -1188,9 +1242,10 @@ export interface RemoteVideoStats {
      */
     totalActiveTime: number
     /**
-     * @since 3.1.0
+     * The total publish duration (ms) of the remote video stream.
+     *
+     * @since v3.1.2.
      *
-     * TODO(doc)
      */
     publishDuration: number
 }
diff --git a/src/src/Enums.ts b/src/src/Enums.ts
index 152730995..e3e47f8f7 100644
--- a/src/src/Enums.ts
+++ b/src/src/Enums.ts
@@ -1,5 +1,5 @@
 /**
- * IP areas
+ * Regions for connection.
  */
 export enum AreaCode {
     /**
@@ -228,8 +228,8 @@ export enum AudioOutputRouting {
 export enum AudioProfile {
     /**
      * 0: Default audio profile.
-     * - In the Communication profile: A sample rate of 32 KHz, audio encoding, mono, and a bitrate of up to 18 Kbps.
-     * - In the Live-broadcast profile: A sample rate of 48 KHz, music encoding, mono, and a bitrate of up to 52 Kbps.
+     * - In the `Communication` profile: A sample rate of 32 KHz, audio encoding, mono, and a bitrate of up to 18 Kbps.
+     * - In the `LiveBroadcasting` profile: A sample rate of 48 KHz, music encoding, mono, and a bitrate of up to 64 Kbps.
      */
     Default = 0,
     /**
@@ -237,27 +237,27 @@ export enum AudioProfile {
      */
     SpeechStandard = 1,
     /**
-     * 2: A sample rate of 48 KHz, music encoding, mono, and a bitrate of up to 48 Kbps.
+     * 2: A sample rate of 48 KHz, music encoding, mono, and a bitrate of up to 64 Kbps.
      */
     MusicStandard = 2,
     /**
-     * 3: A sample rate of 48 KHz, music encoding, stereo, and a bitrate of up to 56 Kbps.
+     * 3: A sample rate of 48 KHz, music encoding, stereo, and a bitrate of up to 80 Kbps.
      */
     MusicStandardStereo = 3,
     /**
-     * 4: A sample rate of 48 KHz, music encoding, mono, and a bitrate of up to 128 Kbps.
+     * 4: A sample rate of 48 KHz, music encoding, mono, and a bitrate of up to 96 Kbps.
      */
     MusicHighQuality = 4,
     /**
-     * 5: A sample rate of 48 KHz, music encoding, stereo, and a bitrate of up to 192 Kbps.
+     * 5: A sample rate of 48 KHz, music encoding, stereo, and a bitrate of up to 128 Kbps.
      */
     MusicHighQualityStereo = 5,
 }
 
 /**
- * Use mode of the onRecordAudioFrame callback.
+ * Use mode of the `RecordAudioFrame` callback.
  *
- * TODO setPlaybackAudioFrameParameters
+ * //TODO setPlaybackAudioFrameParameters
  */
 export enum AudioRawFrameOperationMode {
     /**
@@ -517,9 +517,8 @@ export enum AudioScenario {
 
 /**
  * Audio session restriction.
- *
- * TODO iOS setAudioSessionOperationRestriction
  */
+//TODO iOS setAudioSessionOperationRestriction
 export enum AudioSessionOperationRestriction {
     /**
      * 0: No restriction, the SDK has full control of the audio session operations.
@@ -959,23 +958,26 @@ export enum DegradationPreference {
  */
 export enum EncryptionMode {
     /**
-     * TODO(doc)
+     * @deprecated
+     * 0: This mode is deprecated.
      */
     None = 0,
     /**
-     * (Default) 128-bit AES encryption, XTS mode.
+     * 1: (Default) 128-bit AES encryption, XTS mode.
      */
     AES128XTS = 1,
     /**
-     * 128-bit AES encryption, ECB mode.
+     * 2: 128-bit AES encryption, ECB mode.
      */
     AES128ECB = 2,
     /**
-     * 256-bit AES encryption, XTS mode.
+     * 3: 256-bit AES encryption, XTS mode.
      */
     AES256XTS = 3,
     /**
-     * TODO(doc)
+     * 4: 128-bit SM4 encryption, ECB mode.
+     *
+     * @since v3.1.2.
      */
     SM4128ECB = 4,
 }
@@ -1087,7 +1089,9 @@ export enum ErrorCode {
      */
     InvalidChannelId = 102,
     /**
-     * TODO(doc)
+     * 103: Fails to get server resources in the specified region. Please try to specify another region.
+     *
+     * @since v3.1.2.
      */
     NoServerResources = 103,
     /**
@@ -1263,11 +1267,11 @@ export enum ErrorCode {
      */
     AdmRecordAudioFailed = 1018,
     /**
-     * 1020: Audio Device Module: Abnormal audio playback frequency.
+     * 1020: Audio device module: The audio playback frequency is abnormal, which may cause audio freezes. This abnormality is caused by high CPU usage. Agora recommends stopping other apps.
      */
     AdmPlayAbnormalFrequency = 1020,
     /**
-     * 1021: Audio Device Module: Abnormal audio recording frequency.
+     * 1021: Audio device module: The audio recording frequency is abnormal, which may cause audio freezes. This abnormality is caused by high CPU usage. Agora recommends stopping other apps.
      */
     AdmRecordAbnormalFrequency = 1021,
     /**
@@ -1490,8 +1494,8 @@ export enum LogFilter {
 /**
  * Media device type.
  *
- * TODO MacOS AgoraMediaDeviceType
  */
+//TODO MacOS AgoraMediaDeviceType
 export enum MediaDeviceType {
     /**
      * -1: Unknown device.
@@ -1518,8 +1522,8 @@ export enum MediaDeviceType {
 /**
  * Media type.
  *
- * TODO LiveEngine
  */
+//TODO LiveEngine
 export enum MediaType {
     /**
      * 0: No audio and video.
@@ -1541,9 +1545,8 @@ export enum MediaType {
 
 /**
  * The metadata type.
- *
- * TODO registerMediaMetadataObserver
  */
+//TODO registerMediaMetadataObserver
 export enum MetadataType {
     /**
      * -1: The metadata type is unknown.
@@ -1632,10 +1635,10 @@ export enum NetworkType {
 }
 
 /**
- * Default camera position
+ * Default camera position.
  *
- * TODO AgoraRtcDefaultCamera
  */
+//TODO AgoraRtcDefaultCamera
 export enum RtcDefaultCameraPosition {
     /**
      * 0: Front camera
@@ -1650,8 +1653,8 @@ export enum RtcDefaultCameraPosition {
 /**
  * Lifecycle of the CDN live video stream.
  *
- * TODO AgoraPublisherConfiguration
  */
+//TODO AgoraPublisherConfiguration
 export enum RtmpStreamLifeCycle {
     /**
      * 1: Bound to the channel lifecycle. If all hosts leave the channel, the CDN live streaming stops after 30 seconds.
@@ -1805,10 +1808,10 @@ export enum UserPriority {
 }
 
 /**
- * Video buffer type
+ * Video buffer type.
  *
- * TODO iOS AgoraVideoSourceProtocol AgoraVideoSinkProtocol
  */
+//TODO iOS AgoraVideoSourceProtocol AgoraVideoSinkProtocol
 export enum VideoBufferType {
     /**
      * 1: Use a pixel buffer to transmit the video data.
@@ -1841,8 +1844,8 @@ export enum VideoCodecProfileType {
 /**
  * The content hint for screen sharing.
  *
- * TODO MacOS setScreenCaptureContentHint
  */
+//TODO MacOS setScreenCaptureContentHint
 export enum VideoContentHint {
     /**
      * 0: (Default) No content hint.
@@ -1859,7 +1862,7 @@ export enum VideoContentHint {
 }
 
 /**
- * Video frame rate
+ * Video frame rate.
  */
 export enum VideoFrameRate {
     /**
@@ -2125,8 +2128,8 @@ export enum VideoOutputOrientationMode {
 /**
  * Video pixel format.
  *
- * TODO iOS AgoraVideoSinkProtocol
  */
+//TODO iOS AgoraVideoSinkProtocol
 export enum VideoPixelFormat {
     /**
      * 1: I420
@@ -2267,8 +2270,8 @@ export enum VideoRenderMode {
 /**
  * Video rotation.
  *
- * TODO iOS AgoraVideoSourceProtocol AgoraVideoSinkProtocol
  */
+//TODO iOS AgoraVideoSourceProtocol AgoraVideoSinkProtocol
 export enum VideoRotation {
     /**
      * 0: No rotation
@@ -2395,7 +2398,9 @@ export enum WarningCode {
      */
     AdmInterruption = 1025,
     /**
-     * TODO(doc)
+     * 1029: During a call, `AudioSessionCategory` should be set to `AVAudioSessionCategoryPlayAndRecord`, and the SDK monitors this value. If the `AudioSessionCategory` is set to other values, this warning code is triggered and the SDK will forcefully set it back to `AVAudioSessionCategoryPlayAndRecord`.
+     *
+     * @since v3.1.2.
      */
     AdmCategoryNotPlayAndRecord = 1029,
     /**
@@ -2411,11 +2416,18 @@ export enum WarningCode {
      */
     AdmRecordIsOccupied = 1033,
     /**
-     * TODO(doc)
+     * 1040: Audio device module: An error occurs in the audio driver. Solutions:
+     * - Restart your audio device.
+     * - Restart your device where the app runs.
+     * - Upgrade the sound card drive.
+     *
+     * @since v3.1.2.
      */
     AdmNoDataReadyCallback = 1040,
     /**
-     * TODO(doc)
+     * 1042: Audio device module: The audio recording device is different from the audio playback device, which may cause echoes problem. Agora recommends using the same audio device to record and playback audio.
+     *
+     * @since v3.1.2.
      */
     AdmInconsistentDevices = 1042,
     /**
@@ -2427,7 +2439,7 @@ export enum WarningCode {
      */
     AdmGlitchState = 1052,
     /**
-     * 1053: Audio Device Module: the underlying audio settings have changed.
+     * 1053: Audio processing module: A residual echo is detected, which may be caused by the belated scheduling of system threads or the signal overflow.
      */
     ApmResidualEcho = 1053,
 }
@@ -2485,27 +2497,61 @@ export enum VideoCodecType {
 }
 
 /**
- * TODO(doc)
+ * The publishing state.
+ *
+ * @since v3.1.2.
  */
 export enum StreamPublishState {
+    /**
+     * 0: The initial publishing state after joining the channel.
+     */
     Idle = 0,
-
+    /**
+     * 1: Fails to publish the local stream. Possible reasons:
+     * - The local user calls [`muteLocalAudioStream(true)`]{@link RtcEngine.muteLocalAudioStream} or [`muteLocalVideoStream(true)`]{@link RtcEngine.muteLocalVideoStream} to stop sending local streams.
+     * - The local user calls [`disableAudio`]{@link RtcEngine.disableAudio} or [`disableVideo`]{@link RtcEngine.disableVideo} to disable the entire audio or video module.
+     * - The local user calls [`enableLocalAudio(false)`]{@link RtcEngine.enableLocalAudio} or [`enableLocalVideo(false)`]{@link enableLocalVideo} to disable the local audio sampling or video capturing.
+     * - The role of the local user is `Audience`.
+     */
     NoPublished = 1,
-
+    /**
+     * 2: Publishing.
+     */
     Publishing = 2,
-
+    /**
+     * 3: Publishes successfully.
+     */
     Published = 3,
 }
 
 /**
- * TODO(doc)
+ * The subscribing state.
+ *
+ * @since v3.1.2.
  */
 export enum StreamSubscribeState {
+    /**
+     * 0: The initial subscribing state after joining the channel.
+     */
     Idle = 0,
-
+    /**
+     * 1: Fails to subscribe to the remote stream. Possible reasons:
+     * - The remote user:
+     *   - Calls [`muteLocalAudioStream(true)`]{@link RtcEngine.muteLocalAudioStream} or [`muteLocalVideoStream(true)`]{@link RtcEngine.muteLocalVideoStream} to stop sending local streams.
+     *   - The local user calls [`disableAudio`]{@link RtcEngine.disableAudio} or [`disableVideo`]{@link RtcEngine.disableVideo} to disable the entire audio or video module.
+     *   - The local user calls [`enableLocalAudio(false)`]{@link RtcEngine.enableLocalAudio} or [`enableLocalVideo(false)`]{@link enableLocalVideo} to disable the local audio sampling or video capturing.
+     *   - The role of the local user is `Audience`.
+     * - The local user calls the following methods to stop receiving remote streams:
+     *   - Calls [`muteRemoteAudioStream(true)`]{@link RtcEngine.muteRemoteAudioStream}, [`muteAllRemoteAudioStreams(true)`]{@link RtcEngine.muteAllRemoteAudioStreams}, or [`setDefaultMuteAllRemoteAudioStreams(true)`]{@link RtcEngine.setDefaultMuteAllRemoteAudioStreams} to stop receiving remote audio streams.
+     *   - Calls [`muteRemoteVideoStream(true)`]{@link RtcEngine.muteRemoteVideoStream}, [`muteAllRemoteVideoStreams(true)`]{@link RtcEngine.muteAllRemoteVideoStreams}, or [`setDefaultMuteAllRemoteVideoStreams(true)`]{@link RtcEngine.setDefaultMuteAllRemoteVideoStreams} to stop receiving remote video streams.
+     */
     NoSubscribed = 1,
-
+    /**
+     * 2: Subscribing.
+     */
     Subscribing = 2,
-
+    /**
+     * 3: Subscribes to and receives the remote stream successfully.
+     */
     Subscribed = 3,
 }
diff --git a/src/src/RtcChannel.native.ts b/src/src/RtcChannel.native.ts
index 313411567..193f05ee6 100644
--- a/src/src/RtcChannel.native.ts
+++ b/src/src/RtcChannel.native.ts
@@ -560,7 +560,7 @@ export default class RtcChannel implements RtcAudioInterface, RtcVideoInterface,
     /**
      * Registers the metadata observer.
      *
-     * A successful call of this method triggers the [`setMaxMetadataSize`]{@link RtcChannel.setMaxMetadataSize} callback.
+     * A successful call of this method triggers the [`setMaxMetadataSize`]{@link RtcChannel.setMaxMetadataSize} method.
      *
      * This method enables you to add synchronized metadata in the video stream for more diversified live streaming interactions,
      * such as sending shopping links, digital coupons, and online quizzes.
diff --git a/src/src/RtcEngine.native.ts b/src/src/RtcEngine.native.ts
index 07577124e..4d30657ff 100644
--- a/src/src/RtcEngine.native.ts
+++ b/src/src/RtcEngine.native.ts
@@ -414,8 +414,11 @@ export default class RtcEngine implements RtcUserInfoInterface, RtcAudioInterfac
     }
 
     /**
-     * Specifies an SDK output log file.
+     * Sets the log files that the SDK outputs.
      *
+     * By default, the SDK outputs five log files, `agorasdk.log`, `agorasdk_1.log`, `agorasdk_2.log`, `agorasdk_3.log`, `agorasdk_4.log`, each with a default size of 1024 KB.
+     * These log files are encoded in UTF-8. The SDK writes the latest logs in `agorasdk.log`. When `agorasdk.log` is full, the SDK deletes the log file with the
+     * earliest modification time among the other four, renames `agorasdk.log` to the name of the deleted log file, and creates a new `agorasdk.log` to record latest logs.
      * The log file records all log data for the SDK’s operation. Ensure that the directory for the log file exists and is writable.
      *
      * **Note**
@@ -441,12 +444,12 @@ export default class RtcEngine implements RtcUserInfoInterface, RtcAudioInterfac
     }
 
     /**
-     * Sets the log file size (KB).
+     * Sets the size (KB) of a log file that the SDK outputs.
      *
-     * The Agora SDK has two log files, each with a default size of 512 KB.
-     * If you set `fileSizeInKBytes` as 1024 KB, the SDK outputs log files with a total maximum size of 2 MB.
-     * If the total size of the log files exceed the set value, the new output log files overwrite the old output log files.
-     * @param fileSizeInKBytes The SDK log file size (KB).
+     * By default, the SDK outputs five log files, `agorasdk.log`, `agorasdk_1.log`, `agorasdk_2.log`, `agorasdk_3.log`, `agorasdk_4.log`, each with a default size of 1024 KB. These log files are encoded in UTF-8. The SDK writes the latest logs in `agorasdk.log`.
+     * When `agorasdk.log` is full, the SDK deletes the log file with the earliest modification time among the other four, renames `agorasdk.log` to the name of the deleted log file, and create a new `agorasdk.log` to record latest logs.
+     * @param fileSizeInKBytes The size (KB) of a log file. The default value is 1024 KB. If you set `fileSizeInKByte` to 1024 KB, the SDK outputs
+     * at most 5 MB log files; if you set it to less than 1024 KB, the maximum size of a log file is still 1024 KB.
      */
     setLogFileSize(fileSizeInKBytes: number): Promise<void> {
         return AgoraRtcEngineModule.setLogFileSize(fileSizeInKBytes)
@@ -1910,21 +1913,35 @@ export default class RtcEngine implements RtcUserInfoInterface, RtcAudioInterfac
     }
 
     /**
-     * TODO(doc)
+     * Enables/Disables the built-in encryption.
      *
-     * @param enabled
-     * @param config
+     * @since v3.1.2.
+     *
+     * In scenarios requiring high security, Agora recommends calling `enableEncryption` to enable the built-in encryption before joining a channel.
+     *
+     * All users in the same channel must use the same encryption mode and encryption key. Once all users leave the channel, the encryption key of this channel is automatically cleared.
+     *
+     * **Note**
+     * - If you enable the built-in encryption, you cannot use the RTMP streaming function.
+     * - Agora supports four encryption modes. If you choose an encryption mode (excepting `SM4128ECB` mode), you need to add an external encryption library when integrating the SDK. For details, see the advanced guide *Channel Encryption*.
+     *
+     *
+     * @param enabled Whether to enable the built-in encryption.
+     * - `true`: Enable the built-in encryption.
+     * - `false`: Disable the built-in encryption.
+     * @param config Configurations of built-in encryption schemas. See [`EncryptionConfig`]{@link EncryptionConfig}.
      */
     enableEncryption(enabled: boolean, config: EncryptionConfig): Promise<void> {
         return AgoraRtcEngineModule.enableEncryption(enabled, config);
     }
 
     /**
-     * @deprecated TODO(doc)
-     *
      * Sets the built-in encryption mode.
      *
-     * The Agora SDK supports built-in encryption, which is set to `aes-128-xts` mode by default.
+     * @deprecated
+     * Deprecated as of v3.1.2. Use [`enableEncryption`]{@link enableEncryption} instead.
+     *
+     * The Agora SDK supports built-in encryption, which is set to `AES128XTS` mode by default.
      * Call this method to set the encryption mode to use other encryption modes.
      * All users in the same channel must use the same encryption mode and password.
      *
@@ -1953,10 +1970,11 @@ export default class RtcEngine implements RtcUserInfoInterface, RtcAudioInterfac
     }
 
     /**
-     * @deprecated TODO(doc)
-     *
      * Enables built-in encryption with an encryption password before joining a channel.
      *
+     * @deprecated
+     * Deprecated as of v3.1.2. Use [`enableEncryption`]{@link enableEncryption} instead.
+     *
      * All users in a channel must set the same encryption password.
      * The encryption password is automatically cleared once a user leaves the channel.
      * If the encryption password is not specified or set to empty, the encryption functionality is disabled.
diff --git a/src/src/RtcEvents.ts b/src/src/RtcEvents.ts
index ae3a4075d..98c5823ff 100644
--- a/src/src/RtcEvents.ts
+++ b/src/src/RtcEvents.ts
@@ -357,7 +357,7 @@ export type VideoFrameWithUidCallback =
     (uid: number, width: number, height: number, elapsed: number) => void
 export type UrlWithErrorCallback =
 /**
- * @param url The RTMP URL address.
+ * @param url The RTMP streaming URL.
  * @param error The detailed error information.
  */
     (url: string, error: ErrorCode) => void
@@ -418,20 +418,26 @@ export type FacePositionCallback =
     (imageWidth: number, imageHeight: number, faces: FacePositionInfo[]) => void
 export type StreamPublishStateCallback =
 /**
- * TODO(doc)
+ * @param channel The channel name.
+ * @param oldState The previous publishing state. See [`StreamPublishState`]{@link StreamPublishState}.
+ * @param newState The current publishing state. See [`StreamPublishState`]{@link StreamPublishState}.
+ * @param elapseSinceLastState The time elapsed (ms) from the previous state to the current state.
  */
     (channel: string, oldState: StreamPublishState, newState: StreamPublishState, elapseSinceLastState: number) => void
 export type StreamSubscribeStateCallback =
 /**
- * TODO(doc)
+ * @param channel The channel name.
+ * @param oldState The previous publishing state. See [`StreamPublishState`]{@link StreamPublishState}.
+ * @param newState The current publishing state. See [`StreamPublishState`]{@link StreamPublishState}.
+ * @param elapseSinceLastState The time elapsed (ms) from the previous state to the current state.
  */
     (channel: string, oldState: StreamSubscribeState, newState: StreamSubscribeState, elapseSinceLastState: number) => void
 
 /**
- * The SDK uses the [`RtcEngineEvents`]{@link RtcEngineEvents} interface class to send callbacks to the application, and the application inherits the methods of this interface class to retrieve these callbacks.
+ * Callbacks.
  *
+ * The SDK uses the [`RtcEngineEvents`]{@link RtcEngineEvents} interface class to send callbacks to the application, and the application inherits the methods of this interface class to retrieve these callbacks.
  * All methods in this interface class have their (empty) default implementations, and the application can inherit only some of the required events instead of all of them.
- *
  * In the callbacks, the application should avoid time-consuming tasks or call blocking APIs (such as SendMessage), otherwise, the SDK may not work properly.
  */
 export interface RtcEngineEvents {
@@ -640,7 +646,7 @@ export interface RtcEngineEvents {
     /**
      * Occurs when the first local audio frame is sent.
      *
-     * @deprecated TODO(doc)
+     * @deprecated Deprecated as of v3.1.2. Use [`FirstLocalAudioFramePublished`]{@link RtcEngineEvents.FirstLocalAudioFramePublished} instead.
      *
      * @event FirstLocalAudioFrame
      */
@@ -1247,37 +1253,69 @@ export interface RtcEngineEvents {
     MetadataReceived: MetadataCallback
 
     /**
-     * TODO(doc)
+     * Occurs when the first audio frame is published.
+     *
+     * @since v3.1.2.
+     *
+     * The SDK triggers this callback under one of the following circumstances:
+     * - The local client enables the audio module and calls [`joinChannel`]{@link joinChannel} successfully.
+     * - The local client calls [`muteLocalAudioStream(true)`]{@link RtcEngine.muteLocalAudioStream} and [`muteLocalAudioStream(false)`]{@link RtcEngine.muteLocalAudioStream} in sequence.
+     * - The local client calls [`disableAudio`]{@link RtcEngine.disableAudio} and [`enableAudio`]{@link RtcEngine.enableAudio} in sequence.
      */
     FirstLocalAudioFramePublished: ElapsedCallback
 
     /**
-     * TODO(doc)
+     * Occurs when the first video frame is published.
+     *
+     * @since v3.1.2.
+     *
+     * The SDK triggers this callback under one of the following circumstances:
+     * - The local client enables the video module and calls [`joinChannel`]{@link joinChannel} successfully.
+     * - The local client calls [`muteLocalVideoStream(true)`]{@link RtcEngine.muteLocalVideoStream} and [`muteLocalVideoStream(false)`]{@link RtcEngine.muteLocalVideoStream} in sequence.
+     * - The local client calls [`disableVideo`]{@link RtcEngine.disableVideo} and [`enableVideo`]{@link RtcEngine.enableVideo} in sequence.
      */
     FirstLocalVideoFramePublished: ElapsedCallback
 
     /**
-     * TODO(doc)
+     * Occurs when the audio publishing state changes.
+     *
+     * @since v3.1.2.
+     *
+     * This callback indicates the publishing state change of the local audio stream.
      */
     AudioPublishStateChanged: StreamPublishStateCallback
 
     /**
-     * TODO(doc)
+     * Occurs when the video publishing state changes.
+     *
+     * @since v3.1.2.
+     *
+     * This callback indicates the publishing state change of the local video stream.
      */
     VideoPublishStateChanged: StreamPublishStateCallback
 
     /**
-     * TODO(doc)
+     * Occurs when the audio subscribing state changes.
+     *
+     * @since v3.1.2.
+     *
+     * This callback indicates the subscribing state change of a remote audio stream.
      */
     AudioSubscribeStateChanged: StreamSubscribeStateCallback
 
     /**
-     * TODO(doc)
+     * Occurs when the video subscribing state changes.
+     *
+     * @since v3.1.2.
+     *
+     * This callback indicates the subscribing state change of a remote video stream.
      */
     VideoSubscribeStateChanged: StreamSubscribeStateCallback
 
     /**
-     * TODO(doc)
+     * Reports events during the RTMP streaming.
+     *
+     * @since v3.1.2.
      */
     RtmpStreamingEvent: UrlWithErrorCallback
 }
@@ -1581,27 +1619,45 @@ export interface RtcChannelEvents {
     MetadataReceived: MetadataCallback
 
     /**
-     * TODO(doc)
+     * Occurs when the audio publishing state changes.
+     *
+     * @since v3.1.2.
+     *
+     * This callback indicates the publishing state change of the local audio stream.
      */
     AudioPublishStateChanged: StreamPublishStateCallback
 
     /**
-     * TODO(doc)
+     * Occurs when the video publishing state changes.
+     *
+     * @since v3.1.2.
+     *
+     * This callback indicates the publishing state change of the local video stream.
      */
     VideoPublishStateChanged: StreamPublishStateCallback
 
     /**
-     * TODO(doc)
+     * Occurs when the audio subscribing state changes.
+     *
+     * @since v3.1.2.
+     *
+     * This callback indicates the subscribing state change of a remote audio stream.
      */
     AudioSubscribeStateChanged: StreamSubscribeStateCallback
 
     /**
-     * TODO(doc)
+     * Occurs when the video subscribing state changes.
+     *
+     * @since v3.1.2.
+     *
+     * This callback indicates the subscribing state change of a remote video stream.
      */
     VideoSubscribeStateChanged: StreamSubscribeStateCallback
 
     /**
-     * TODO(doc)
+     * Reports events during the RTMP streaming.
+     *
+     * @since v3.1.2.
      */
     RtmpStreamingEvent: UrlWithErrorCallback
 }