Thanks for reaching out. Have you tried checking in your Video Manager? Also, search with video name or share the video URL, if you've so that we can check on our end. Keep us posted.
While we can't cover specifics, have you already checked our Help Center article on trouble shooting video takedowns: https://goo.gl/BEUHkC ? Let us know if this helps.
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.