If your YouTube homepage is showing videos in a list view (instead of a grid) this is not an intentional change and we're working to fix it! Thanks for all of your reports, and we'll share another update when the issue is resolved.
Appreciate the screenshot – to confirm, are you having issues adding a thumbnail on your video? If so, try this guide: https://yt.be/help/STpv . Otherwise, send us more details of the issue.
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I uploaded a video, then made a thumbnail, but when I wanted to put it up it had the words: "Unexpected end of JSON input" what does that mean & how to solve my problem ...
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Hmm, that's weird. Have you tried clearing the cache and cookies of your browser? If that didn't' do it, try re logging in as well. Keep us posted.
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