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I ended up fixing a problem where I added a document but, couldn’t see the interface in my WP-admin after I updated the page, nor, see the viewer in my post using Firefox.
After going a little cray-cray it turns out, my using the EFF.org PrivacyBadger ad-blocker, requires me to allow ‘documentservices.adobe.com’. Once I did that I am able to see the plugin interface and document on my pages.
Excellent plugin BTW! Allows full mobile pinch-zooming where others don’t.