Thanks for reaching out. We've seen similar reports from the other users too and are working on it. In the meantime, try re-uploading the thumbnail to see if that makes any difference. Let us know if this helps clear things up.
@TeamYouTube why is my thumbnail not uploading. We try to upload our thumbnail and it doesn't connect the sources. it just uses the default thumbnail.
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Tried like 16 times. Let us know when you guys fix this. Thank you.
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