Hmm, we've checked this at our end and see that the thumbnail is working fine. Could you try updating the app or reinstalling as it often fixes most issues? Also, try on a different device/browser. 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
Hmm, we've checked this at our end and see that the thumbnail is working fine. Could you try updating the app or reinstalling as it often fixes most issues? Also, try on a different device/browser. Keep us posted.