Hmm, if you haven't already, try clearing your browser's cache & cookies then relaunch it before trying again. You can also isolate it by using a different browser. More about channel art and its guidelines here: https://yt.be/help/sg6D . Hope this helps!
@TeamYouTube for the past 24 hours been trying to change my channel art but getting error message “the feature you requested is current unavailable” can you help? #teamyoutube #channelart
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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