Thanks for reaching out. What device are you using to upload the video? Also, here's an additional guide on videos taking a longer time to upload/stuck during upload: https://goo.gl/yGeYve . Let us know if this helps.
@TeamYouTube my video is stuck at 40% I’ve been uploading it since 12:00 on the afternoon
-
-
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.