What is iCloud?
iCloud is Apple's cloud storage service. iCloud stores music, photos, documents, and more and wirelessly pushes them to Mac and iOS devices. See Apple's website for more information about iCloud.
What do I need to use PDFpen with iCloud?
You'll need to have PDFpen (or PDFpenPro) 5.7 or later. You'll also need to set up your iCloud account.
Apple restricts iCloud access to applications purchased through the Mac App Store. If you purchased PDFpen or PDFpenPro from Smile directly, you can still use Dropbox to store your PDFs in the cloud and access them from your Mac, iPad and iPhone. PDFpen for iPad and PDFpen for iPhone support Dropbox syncing