We'd like to help. Could you try clearing the cache/cookies of your browser? Also, try checking it on Incognito mode. Let us know if that makes a difference.
@TeamYouTube I can’t change my thumbnails and get the error “Invalid JSON String”. Can you help me out, it’s been happening for days on Chrome only.
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I cleared the cache and cookies and tried in normal and incognito mode as well as from different devices but I’m getting the same error
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