Joomla 3.6.5, PDF Embed installed correctly. Button present in editor.
When I enter the full path to a PDF file in an article, using this syntax:

{pdf=http://www.mysite.com/media/media/document.pdf|500|300}

nothing appears on the page. (path checked separately in browser for accuracy - it is correct)

The code on the page shows this:
<div class ="embed-container native-embed-container">
<embed src="http://mysite.com/media/media/document.pdf" style="width:500px; height:300px;"frameborder="1"/></div>

No other way to debug this that I can see. Ideas?

TIA!