thumbnail problems

Hey guys. I uploaded a new video today, and for some reason my custom thumbnail will not appear when I go to my channel. When I go back into video creator and edit the video information, the custom thumbnail won't even be there, and it'll have one of the suggested thumbnails in the custom...

Hi guys! I was wondering what kind of thumbnails are good to have on a youtube channel. I've seen a lot of youtubers that use like a photo from that specific video and then adds text or other stuff on it or should one create one from scratch and like not have a photo from that video and...

Anybody else having a problem? Just uploaded a new video and it's refusing to put the thumbnail in only having this... Looked at a person I'm subbed to and it looks like they had the same issue and they're pretty big (500k+) Loaded mine in the last hour, hope they fix this soon because it...