Try the steps in this guide and let us know if that fixes the issue: https://goo.gl/2Vd6Lp . Hope this gets resolved!
@YouTube is crashing on me today @TeamYouTube . I'm getting a hard time uploading and it using my DATA connection instead of my Wi-Fi connection!pic.twitter.com/zrS46jsBxf
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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