Security Error after upgrading to plugin v.3.0.2

Hello,

I’ve gone through all of the steps listed here after upgrading the plugin, but I’m still getting a “Security Error: PDF files must be hosted on the same domain as this site” error on any page that features a PDF, like this one in a testing environment. For reference, the previous version of the plugin we had installed was 2.2.3.

For reference, you can see the same PDF loading on the live site correctly here.

The page I need help with: [log in to see the link]