Sorry for the trouble. We've seen similar reports from users regarding custom thumbnails not getting updated and are trying to fix it. Appreciate your patience in the meantime.
@TeamYouTube the custom thumbnails I upload for my videos are disappearing, and getting replaced with the second recommended option. I have tried countless times to re-upload the thumbnails, and have even sent feedback on this issue. I've seen no other reports of this.pic.twitter.com/pAACRmXVRt
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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