That's interesting... In theory PushUp should already say the files are incompatible then. Is it a file made with the phone's camera or some other mp4?
I don't know if someone's gonna actually see this at all, but I would like to thank the developer for this wonderfully built application. This is how an app of its kind should behave, deeply plugging into the OS. This shows great talent from the dev and also how open Harmattan really is. Thanks again!