@TeamYouTube This keeps happening on mobile while trying to update a Channel banner.pic.twitter.com/irTfQkKDdG
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
That's odd. Have you tried using a different device to upload the channel art? Also, you can take a look at our Help Center article which has more info on this: https://goo.gl/UupVuY . Let us know how it goes.
Ok thanks
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.