Do you see an error message when you're trying to change the channel art? Also, here's more info on file size and guidelines for the banner: https://goo.gl/KggEgV . Let us know if that helps!
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Do you see an error message when you're trying to change the channel art? Also, here's more info on file size and guidelines for the banner: https://goo.gl/KggEgV . Let us know if that helps!