@TeamYouTube hi, sorry for tweeting you so much recently, I just really don’t think it’s my week. the thumbnail of my newest video isn’t showing on mobile for some reason?pic.twitter.com/14IaB9QJan
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It's because you've watched some of the video, you see the red bar at the bottom.. on mobile when you watch some of the video and come off it the image sometimes changes to the part of the video you stopped at.