U need to render little slices of those videos and they'll be updated to Elite site. You cant upload whole matchfilm there.
Mine did the same thing all you need to do is shut the system off for a few hours. Then it should restart and work. If it doesn't work I don't know what to tell ya.
The big problem is that the videos doesnt upload to Youtube, is obvious that they will be in the vault but they will not be in your profile in Call of duty Elite