Appreciate the report, we're currently investigating. Will keep you updated!
Hmm, have you tried using a different browser to update the thumbnail to see if that helps? Let us know.
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This Tweet is unavailable.
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Hmm, as a next step, please send a feedback report directly from YouTube with these steps: https://goo.gl/WdI0BK . While every individual report may not get a direct response, we do review everything and use the details to investigate and fix issues. Thanks.
End of conversation
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