Embedded PDFs not loading

I had this issue of the Embedded PDFs not loading properly all of a sudden, site-wide. I was not sure where to begin but after reading up the support forum posts, reached out to the Customer support team at PDF Embedder plug-in.

I promptly received response same day (within hours of posting my query) with possible ways to troubleshoot and couple of pointers for me to look at.

I realized it indeed was the act of a caching plug-in coupled with cache accumulated at cloudflare end. Purging the cache and rebuilding same has brought back the functionality.
Now my PDFs load smoothly, as earlier. No issue at all with the plug-in.

Thanks to Emma for the timely response and pointed suggestions.