Hi, the moodle filters work fine in the message box. For example, if a student creates a link to an mp3 file, it will generate the mp3 player code.
I'd like to know how to make it so that if a student drags the mp3 to the ATTACHMENT box, that it will trigger the filter to embed it.
This is exactly how attachments work for a forum post. Drag an mp3 to the attachment box, and it will render the mp3 as a player.