Website only displays link, not pdf

This is happening on all of the pdfs (100s) on the site, and only started happening recently, though I don’t know exactly when.
I turned off all plugins except pdf embedder and that changed nothing.
When I looked at the console I found this message:
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://rv6592.a2cdn1.secureserver.net/wp-content/plugins/pdf-embedder/assets/js/pdfemb.min.js?ver=4.8.2&time=1726280832. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing). Status code: 200.
I don’t know how to fix that error.

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