That's odd! Have you taken a look at our Help Center article on common uploading errors and how to troubleshoot them: https://goo.gl/K8A75e ? Hope this helps.
Thanks for all the details. Could you try changing the file format of the video that you are trying to upload and see if that works? Keep us posted!
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Thanks for the info. We have shared your concern with the team. Someone will reach out to you shortly via email!
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