abort infinite upload for guest users without storage

[call-me-matt]

Steps to reproduce

1. connect as a guest user
2. upload a picture to the chatroom

Expected behaviour

The picture should be shown to everybody or alternatively the upload should be cancelled with an error message. Or, even better, the attachment icon should be hidden if no write permission is granted to the guest.

Actual behaviour

An error message is displayed (briefly), but the uploaded picture is also shown in the chat. To the guest it is not obvious that the shared picture is only visible to her/him and why it disappears with a refresh of the page.

Talk app

Talk app version: (see apps admin page: /index.php/settings/apps) I'm only a guest, but should be the latest and greatest.

[PVince81]

ok, I was confused about the term "guest". so this is not a conversation accessed by public link but as user from the guest app