That's odd, check this Help Center article for videos stuck during upload: https://goo.gl/sXuEMH . Hope this helps!
@TeamYouTube I'm trying to upload and it gets to 93% and stops. Any help?
-
-
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.