That's strange. Could you check if there are any pending updates for your browser? If there are any, try updating it to the latest version available to see if that makes a difference. Let us know!
@TeamYouTube I have tried everything to upload a custom thumbnail, and every single time it says: “Failed JSON input” I have tried clearing browser cookies and history, turning off extensions, but nothing works.
But when I use another browser besides Chrome, It does!
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Yes, it is on version 70.0.3538.110
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