The feature you're referring to is called 'Channel trailer'. Our Help Center article on creating a channel trailer has more information about it: https://goo.gl/dUJ8SN . Hope this 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
The feature you're referring to is called 'Channel trailer'. Our Help Center article on creating a channel trailer has more information about it: https://goo.gl/dUJ8SN . Hope this helps.