Hmm, that's odd. Can you confirm if the thumbnails are sized in 16:9 aspect ratio as it's the most used in YouTube players and previews? Let us know if this helps.
@TeamYouTube Yesterday and today I’ve noticed a thumbnail error on some of my uploads there are black bars on the left and right sides. Only on two but sometimes more depending the device used. I size them as 1280x720. Have never had this problem. Can you fix this? Looks awful.
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Yes it is.
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