Ummmmm... SOMETHING WEIRD IS HAPPENING WITH #YouTube ???
When I search "anime reina scully" on YouTube, NONE of the custom thumbnails show up... FOR WHY? IS THIS JUST ME? @TeamYouTubepic.twitter.com/7XybyXVQWX
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
Afaik, they may still be testing on some users that it shows thumbnails their system picks over the custom thumbnail. It got out they were testing that a few weeks/couple months ago