To scan documents, open WhatsApp on your iPhone, go to the chat, click the plus (+) icon, select Document, and tap Scan Document. You can add up to 24 pages into a single document.

Seems like a straightforward question, but I've not been able to figure it out. I have a Canon MP530 with an auto-document feeder. I've got a couple of magazine articles I'd like to scan to PDF and ...