Hmm, does this happen across devices? Try refreshing the page, checking your network connectivity and then adding your end screen animation & card in your videos. Keep us posted!
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Make sure that the app/browser is up to date and try clearing your browser's cache and cookies with these steps: https://yt.be/help/Cko1 . That usually does the trick. You can also try it on a computer and see if it works there. Keep us posted.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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