@YouTube Are you going to fix your thumbnail problem because this is getting pretty tiring. Even using Studio, thumbnails don’t show and it says they’re saved and everything. Even switching between auto-generated thumbnails doesn’t work. Please tell me you’re fixing this by 2019
We'd like to know more. What device/browser are you using? Do you see this across devices? Could you share screenshots, if any, so that we can look into it better? Keep us posted.