3D FlipBook - Pro Works in Admin Mode Nowhere Else

In admin mode, page editing, the 3D PDF works fine, and also in the "preview". I have tested Chrome, Edge, FireFix, and Epic - The page and 3D PDF appear in Chome but not the other browsers. (Yes, I cleared the cache.) Please Advise.

https://www.rcducantlin.com/ptarmigan-lane/

Roger