Have you tried uploading the thumbnail by following the steps mentioned here: https://goo.gl/Nuqskn ? Keep us posted.
@TeamYouTube
My thumbnail isn’t uploading to a video that I’m trying to upload. Is there a particular reason why? (I’m on mobile)
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When I went to the desktop website and changed the thumbnail, it worked. I tried several times in the mobile studio, but it always failed. Maybe it’s a bug in the app, idk
End of conversation
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