I was having that issue until so I tried using the upload beta. It worked after that. Feeling a bit more forced to use the beta everyday. 
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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Is it the Simon says vid?
Thanks. Twitter will use this to make your timeline better. UndoUndo
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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I uploaded about 10 minutes ago, with the classic uploader. Everything worked like usual
Thanks. Twitter will use this to make your timeline better. UndoUndo
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