Holding ""option," and clicking "get info," has worked for me. However I'm running into a few specific files that no matter what artwork tab is greyed out, and it won't let me change it. However, these specific files also won't play, even though iTunes will accept and add them to my movie lists. So I presune the copy has some copyrighting attached or something else that is keeping iTunes from liking it. I've uploaded about 150 movies lately, and only Oblivion, Drive, Donnie Darko, Enemy at the Gates and Mary Poppins have had this issue. And I've been able to delete and find another version of Mary Poppins, Darko and Drive that would work. But so far two copies of Enemy at the Gates, and 4-5 copies of Oblivion have all had this same issue. If anyone has any thoughts on this I'd appreciate it.