Thanks for reaching out. If you're using browser try clearing cache and cookies and in Incognito mode: https://goo.gl/QQ1aAQ . Also, mind sharing screenshots of the thumbnail issue so we can take a look? Keep us posted.
@YouTube @YTCreators @TeamYouTube I keep getting this message when trying to upload a custom thumbnail on google Chrome “Unexpected end of JSON input”. The only thing that works is using an old Internet Explorer
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Also the Beta creator studio does not show me Thumbnail option
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Cleared everything , disabled all my extensions in Chrome but still... No go
pic.twitter.com/yoDXDHy4He
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Youtube Stars Louie & Marie