We'd like to know more. What device are you using? Do you see an error message when you try to do so? Also, have you already taken a look at this Help Center article on how you can change the profile picture: https://goo.gl/Lo9r2T ? Keep us posted.
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
We'd like to know more. What device are you using? Do you see an error message when you try to do so? Also, have you already taken a look at this Help Center article on how you can change the profile picture: https://goo.gl/Lo9r2T ? Keep us posted.