It is now possible to upload avatar for guest roles.
This is a new feature: guests are not authenticated users: it was impossible to associate an avatar to a no permanent user whose id changes all the time.
Thanks to fingerprinting, we generate now an unique permanent id for guest and avatars are correctly associated to that id.
You can test that new feature on your own chat
This does not appear to work. I’ve tried changing an avatar and it does not change