And if so how?

I have been searching and searching and I cannot seem to find a definitive answer. So my search criteria must suck.

I have a Pandigital Novel with a pre-installed kobo app that can import my PDFs purchased from another store. This is an app on a 1.5(or 1.6) android platform.

But the Kobo app I have running on an android 2.1 tablet does not appear to find any pdfs on my SD card.

Any suggestions?

I have an iPhone, but this might help. I can email the PDF to myself, open the email on my iPhone, and then I have the option of which app to open the attachment in. Also with iTunes, you can assign specific documents to specific apps, like Kobo.