Yep, he's right. Videos synced from your PC are stored in the music+videos hub. Videos you download onto your phone via UC Browser may be exported there as well. Though, videos downloaded through some other apps are stored in the apps themselves and don't lend the videos to the hub (*cough*Photos*cough*)The ones you transfer from your pc. Like music videos or tv shows you know every video file except you shoot.
. Videos you download onto your phone via UC Browser may be exported there as well.