We've confirmed there are no related technical issues. Also, have you checked this troubleshooter that covers common uploading errors and steps on how to fix these issues: https://goo.gl/Q9UCB8 ? Let us know if this helps!
We'd like to help. Just to confirm, have you tried clearing the browser's cache & cookies to see if that fixes the issue? Here's how: https://goo.gl/3HcKQ7 . Also, try if using Incognito mode or a different browser makes a difference. Keep us posted.
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