BA Gallery Thumbnails or Background Color

Hello, why are there no YouTube thumbs on the gallery when I save the videos? Is there a way to add on manually? I cannot find any way to add one to replace this. I'd settle for a background color so you can read the text on the video.
I have used this gallery for videos before, and it showed the YouTube thumbnails.
https://daveb145.sg-host.com/resources/video-gallery

Replies are visible only to logged in members with an active subscription.