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If a user clicks or taps and holds the paste function (or moves the keyboard focus on it and waits for a couple of seconds), a tooltip will show the number and type of items currently in the clipboard (e.g. 5 videos for a set of videos or 3 items for a set containing items of mixed type) and will highlight all items in the current view accepting a paste of the content in the clipboard. This effect disappears again if the mouse button is released or the tap ends. Note that click/tap and hold, followed by a release does not cause a paste operation - you have to click/tap the paste button again.
Mockups
