STOP with the advertising/up-sell notifications!
When I open a PDF, I expect to be able to interact with it as soon as it loads, not have to wait 15 seconds while a stupid up-sell overlay loads and then have to close that before I can actually READ the PDF. That **** should be in a newsletter, not in the **** app.
Sorry for the trouble you faced. Can you please attach a screenshot of the dialog you are seeing.