Our Creator Support team can dive into this further with you, contact them here: https://goo.gl/BxLi8H . Hope this gets resolved!
@TeamYouTube Dear Youtube team I have a problem and I have come in search of the solution what happens is that I update the miniature of my video to a personalized one and it is already 3 days and it continues with the thumbnail established by youtube it is not updated
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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