3D FlipBook - Hey just purchased the plugin and it looks great! Have a loading issue for some reason, the test PDF I posted loads greatly

Hey just purchased the plugin and it looks great!

Have a loading issue for some reason, the test PDF I posted loads greatly into the nw book and populates all the 21 pages included with images.

When viewing the link after posting the frame loads but with 4 blank pages.

What do you think the issue can be?

https://lucidhive.com/bespokebeauty/3d-flip-book/portfolio/?preview_id=8369&preview_nonce=b0e79808c6&preview=true