Thanks for reaching out. Have you tried clearing your browser's cache and cookies: https://goo.gl/dwzcyo ? Also, take a look at the info under 'Custom thumbnail best practices' in our Help Center article: https://goo.gl/UaX5CE ? Hope this helps.
@TeamYouTube I recently post a video samsung a8 star vs oneplus 6 but this video thumbnail is not showing what is reason? please help me and solve this problem Thanku.pic.twitter.com/rkNMFv62XY
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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