Can I use PDFpen Scan+ with PDFpen for iPad or iPhone?

Yes, you can export documents from one app to the other.

Send a document from PDFpen to PDFpen Scan+:

1. Open PDFpen. From the main Documents view tap "Edit".
2. Tap the document you wish to transfer.
3. Tap the Share icon 
   

    in the menu bar then "Copy to Scan+."

Send a document from PDFpen Scan+ to PDFpen:

1. Open the document in PDFpen Scan+.
2. Tap the Share icon  in the toolbar then "Open In' and then choose 'Copy to PDFpen' from the share menu. . 

Auto Export all new Scans to PDFpen's iCloud Folder

1. Open Scan+ and tap the wrench to access the tools menu.
2. Tap on 'New Document Settings'.
3. Enable PDFpen's iCloud Folder  (Note: this will disable Auto-Export to Dropbox if it's currently enabled.)