You forgot to tell us what the problem is.
Fortunately, it's pretty obvious: a website cannot access files on the user's device.
You are asking a page hosted on
to display a file stored in your local application data folder. That is never going to work.
The Xamarin docs archive has some information about displaying a local PDF file by using a local script:
docs-archive/Recipes/xamarin-forms/Controls/display-pdf at master · xamarin/docs-archive · GitHub