Thanks for reaching out to us. Does this happen across devices? Also, try uninstalling the app updates, restart the device and reinstall them to see if it makes a difference. Let us know.
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Yes it happens on all devices. As you can see in the screenshot of the edit page it even shows the auto generated thumbnail on desktop under the auto generated ones despite showing the correct one on the embedded video. This is an issue with YouTube itself, not the app.
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Have this problem to, I upload and don't press "save changes" until the thumbnail is ready and uploaded
Thanks. Twitter will use this to make your timeline better. UndoUndo
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