With all paid plans, you have access to add Animation to your images and download as a mp4. You'll click +Add Animation on the particular item that you wish to animate - book covers, text, images, elements or background!
Here is a short video on How to Add Animation: Watch Now
Here is a handy blog post on how to use Animation: https://bookbrush.com/reasons-to-use-animations-in-book-ads-to-capture-interest/
Related topic: Animated Cover Reveal