@TeamYouTube I haven't been able to update my channel art. I'm signed into Google but still I receive this error message.pic.twitter.com/UC8uHum9Ss
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We'd like to know more. Mind confirming the device you are trying to change/edit the channel art? Also, clearing your browser's cache and cookies clears things up on desktop, updating/reinstalling the app often fixes most issues on your mobile device. Keep us posted.