Copy files to Media Libraries
To copy a video, audio, or image file to another Media Library, click Media options for the file you want to copy, then "Copy."
You'll see a list of all the Media Libraries you can copy to. You can copy the file to one or many of these Media Libraries.
Simply click the names of the Media Libraries you want to copy to — they'll turn green, so you know the copy was successful.
You can now navigate away from the page.
See also: Transfer Ownership of a media asset.