I have the lite version of 3D Flipbook's which is great. I will have over 300 pdf's loaded on my site soon. Is there a way to display the gallery over several pages with say 25 or 50 books per page? This will make the gallery page load much quicker and make scanning for a book to read much easier for my visitors.
yes it is, you need to create a custom template page for your gallery and use query parameter:
[3d-flip-book mode="thumbnail-lightbox" query='{"orderby": "date", "order": "ASC"}' cols="3" tax=""][/3d-flip-book]
- all options: https://developer.wordpress.org/reference/classes/wp_query/