We'd like to help. Which device are you trying to upload? Also, do you see an specific error message? Also, share possible screenshots for us to look into it. Keep us posted.
Thanks for the info. Could you try clearing cache and cookies of the browser, here's how: http://yt.be/help/V8qD ? Also, try using a different browser/Incognito mode to see if that makes any difference. Keep us posted.
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As a next step, we recommend you to send a feedback report directly from YouTube with these steps: https://yt.be/help/AEQt . While you may not get a direct response, we review everything to investigate the issue and fix it.
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