That's strange. Have you noticed this happening across devices? Also, could you share a few screenshots so that we can take a look into it? Thanks.
@TeamYouTube HELP! As of my last two videos, uploading a Custom Thumbnail doesn't save - it just reverts back to a generic screenshot! :-(
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Hold on a second - let me try it on my other PC, and I'll let you know if the result is the same. :)
End of conversation
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