How to make the toolbar fixed for mobile devices

In the desktop browsers we can get the toolbar by hovering, but on the mobile browsers, its not display the bottom bar, nor indicate the arrows for the next page.

How can we get the next page indication or slide arrows? to guide the users, that here are move pages to the PDF file?

Screenshot:

There is no indication if this document has any additional pages, or to move left or right, to see more pages of the pdf file.