Hello @TeamYouTube , I would like to know, why are not the thumbnails of the videos on my channel? What happens is that all my videos had thumbnails, and now they are no longer seen.pic.twitter.com/10DKNkIopT
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
People have made fine points here, so my small addition is: making Youtube videos and pages, the whole process, is an art form. Why in the world would you think it's a good idea to completely alter part of that art, unbeknowst to an artist, using a program???