How do I delete (remove) media from the Site Library or from a Collection?
Instructors and site Organizers can remove media from a site Library or from a Collection. Media cannot be deleted or removed from a user's My Media space.
Click Site Library (or a Collection)
At the bottom of the thumbnail for the item, click Remove.
This automatically removes the media from the Site Library or from the Collection.
Note:
Removing a media item from the Site Library also removes the same item from a Collection.
Removing a media item from a Collection, does not remove the same item from the Site Library.
Removing a media item from either the Site Library or a Collection does not remove the media from the user's My Media space.