To upload custom thumbnails, you must have a verified account. Go here to verify your account: https://goo.gl/6X67FP . Hope that helps clarify!
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
To upload custom thumbnails, you must have a verified account. Go here to verify your account: https://goo.gl/6X67FP . Hope that helps clarify!