Can you please elaborate on the cache issue possibility? We are not currently using any cache plugin on this site. The host is Flywheel which employs a CDN (powered by Fastly) on all sites. Does the PDF preview require a cache plugin? Would it be made better by one, or are you saying some sort of caching now is what is making it not work? If you are suggesting we add one, do you have a recommendation for a plugin you know to work that is a “better” one?
(The auto-downloading I originally experienced doesn’t seem to be happening any more after recent Download Manager updates.)
Thanks!