Thanks for the report. We've seen a few others mention this too and passing the info along. Can you also submit a feedback report from the account experiencing the issue? Here are the steps: https://goo.gl/WdI0BK . That should help us investigate.
@TeamYouTube the custom thumbnail I’ve uploaded for my newest video is continuously disappearing. I’ve tried to upload a custom thumbnail when I originally posted the video, and today twice now, but it seems to disappear after I hit save changes and refresh the page. Any advice?
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Thank you so much
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