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.
Go to the Media Gallery tool.
Click Site Library (or a Collection)
This displays the media located in the Site Library or in the 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.