Yikes! Just to confirm, have you tried uploading the thumbnail from a different device/browser? Also, try clearing the browsers cache & cookies to see if that makes a difference. Here's how: https://goo.gl/T5xS6b . Let us know.
@TeamYouTube I'm having a serious issue with the thumbnail for my latest video. I literally changed the thumbnail and it reverted back to the autogenerated thumbnail. It's only when you click on the video and it loads do you see the new thumbnail. Pls fix and pls remove update
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I didnt try uploading on a different device because the thumbnail is on my computer
End of conversation
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