@TeamYouTube So as you may know, I've been trying to change my channel art for some time now. I use an Acer Chromebook, and though you've told me, among other things, to change my browser, I am unable to do that. However I did find a way to upload my channel art. Fixed it lmao
No problem! Also, if anyone else has this same problem, and are using the Chrome browser, then it would be a good idea to go to: Settings > Advanced > Privacy and Security > Content Settings > Cookies > and disable "Block Third Party Cookies". This method worked for me ^^