I want to Import from Scanner. How can I get my scanner to appear under Devices?
We use Apple's Image Capture framework for our scanning support, so your scanner should appear in the Image Capture application. If you do not see your scanner, you might try contacting Apple (AppleCare for your Mac) to see if they can help get your scanner working with Image Capture. Once that's sorted, it should also work with PDFpen. Please check Apple's current list of printer and scanner support.
If you are using the latest macOS, please make sure you have installed the latest driver for your scanner.
If you have a Fujitsu ScanSnap, please see this blog post on how to use your ScanSnap with PDFpen.