From the Knowledgebase

Can you scroll between PDF pages?

In the free version of the plugin, the only way to move between pages in a PDF Embedder embed is using the next/prev arrows in the toolbar.

The Premium (and Premium Secure) version now has functionality allowing the user to continuously scroll down through the document to all pages - using the mouse wheel, click-and-drag etc, or touch on a phone etc.

Please see the Premium demos.