@TeamYouTube did you guys break the thumbnail upload on Classic design? Have been getting "Unexpected end of JSON input" errors for uploading since the studio was rolled out for all of us. A massive pain to go back to the Studio Beta (which is awful) just for that feature.
My money is on a server issue on their end, since it would explain multiple device issues, especially if it was a regional cluster
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They’ve replied separately and confirmed it’s been turned off for classic entirely. So not a bug, will use Studio for them

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That stinks lol - I use beta, but I use the classic uploader because its got better functionality, multiupload, and works with my plugin for upload defaults
End of conversation
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