Plugin does not show any PDF

I can clearly see it at the bottom of the page.

Thanks skulldragon for your feedback.

When I open that page I’m getting this message first: “Can’t load this PDF. Make sure the PDF exists at the URL you’re loading it from.”. In the black frame/box it says “Loading viewer …” but nothing is happening. When I click on that small arrow after “Loading viewer …” THEN a new tab in the browser is opening and I see the gray loader strip at the top moving and eventually the black box in full page view is opened displaying the PDF in the middle.

On my mobile phone the “Loading viewer …” completes relatively quickly and displays the PDF

So the main problem is loading the viewer or the file inside a page on a desktop.
I tried with another browser (Opera) instead of FF but it’s the same thing that is happening.

Why is it blocked?

I moved embedding short-code to another page:
https://terrybraunstein.com/catalogue-and-video/

The problem persists; it maybe caused by a slow internet connection. I’m living in India and connecting trough a mobile phone. However it’s still strange that when clicking on that arrow and opening in full page view the PDF document is displayed.

Just checked it again and it does not work at all.