Pugpig allows you the ability to upload a PDF as an Edition. To do this simply Create a new Pugpig Edition and upload a PDF under the PDF field.
PDF editions will need to be enable in
Pugpig->Settings under the tab
Pugpig Settings tab.
If you upload a PDF this will be viewable in the app instead of existing content. Existing content will not be deleted.
Note: A PDF edition can be free or paid but it cannot have samples.