Thanks for the screenshot. Could you try clearing your browser's cache & cookies and try uploading it on Incognito mode? Also, here's Our Help Center article on supported file formats which gives you more insights on it: https://goo.gl/mxrzbW . Let us know how it goes.
@TeamYouTube I’m trying to upload a video and this keeps popping up, it’s a mp4 file and I also tried a mov file and it won’t let me upload. Thanks and please get back to me when possiblepic.twitter.com/HrapjBIUza
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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