Have you tried clearing the browser's cache & cookies to see if that fixes the issue? Here's how: https://goo.gl/e2dYZt . Keep us posted.
@TeamYouTube apparently the only way I can upload custom thumbnails now for videos or streaming is by using any other browser other than Chrome. Thought you might like to know.
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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