@TeamYouTube For the past week or so newly uploaded videos aren't being published with their thumbnails. Super frustrating to upload, fill out everything, dot every I and cross every T, just to have the custom thumbnail disappear.
Re-adding it doesn't take effect for 10+ minutes
We'd like to know more. What device are you using? Have you experienced similar issues across devices? Share screenshots and more details, we'll take a look.