Thanks for reaching out. Have you tried clearing your browser's cache and cookies? Here's how: https://goo.gl/xhneLi . Also, try using a different browser or Incognito mode to see if that works. Keep us posted.
@TeamYouTube what is going on?
Why can't I add end screen and edit my video before publishing...pic.twitter.com/0huXS9JNyC
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Thanks
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