After an update of our Sametime 8.5.2 Backend infrastructure to Sametime 9.0.1 the Meeting Room Permission for "Present and add to Library" changed automatically from "Everyone" to "Owners and Managers".
The reason for the change is if a user knew enough about how the system works - this could be exploited and an anonymous user could upload files to any room at anytime. This default setting should be in responsibility of the administrators of the system.
Idea 1: Allow administrators to change the default centralize.
Idea 2: Or give the participants the possibility to sent a "Present and add to Library" request to the owner/manager and the owner/manager approve the request.