are you all right @TeamYouTube , do you need to talk?pic.twitter.com/LsX8BA9oqr
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We'd like to help. Have you tried this troubleshooter that covers common uploading errors and how to fix the issue: https://goo.gl/Q9UCB8 ? Let us know how it goes.
That form has no working solution. The issue seems to only occur when the tab in which I upload videos is in the background.
Does this happen for a specific video or for all videos that you upload? Have you tried uploading from a different device to see if that helps? Let us know and we'll look into it.
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