Create Book Screenshots
Screenshots are optional, but if you have a book with a lot of images or interactive content, it’s a good idea to provide them. This gives readers a quick look at what's inside your book without downloading a sample.
Screenshots must be submitted with iTunes Producer, the tool used to submit book files to Apple. You can provide up to five screenshots per book. They must be actual book pages and should ideally be taken on an iPad or iPad Pro. Learn how to take a screenshot on an iOS device.
If you submit screenshots from a computer or other device, be sure to comply with the size requirements in the Apple Books Asset Guide.
After they’ve been provided, screenshots can be replaced, but you can’t remove them altogether.