@TeamYouTube I am not able to upload a custom thumbnail on my video. It says that there is a missing end of JSON, what does this mean?
Thanks for the screenshot. Try unchecking "block third party cookies" in the browser's settings. Also, could you try using a different browser or in Incognito mode to see if that helps? Let us know how it goes.
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Thank you so much! All I had to do was unblock third party cookies. I really appreciate the help!

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You're welcome! Give us a shout if you need any help in the future. We're just a tweet away.
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