@TeamYouTube What does "Unexpected end of JSON input" mean? I'm trying to upload a thumbnail with Chrome on my Laptop. On my PC it doesn't save either as nothing works on Internet Explorer and Chrome doesn't wk there.
That's strange, is this happening to both Creator Studio and YouTube Studio? Also, check out some best practices on customizing video thumbnail here: https://yt.be/help/STpv . Tweet back @ us if needed!