WhatsApp does by default save received images to your photo library (as opposed to e.g. iMessage). You can turn that off, though. And the permission to read fro

WhatsApp does by default save received images to your photo library (as opposed to e.g. iMessage). You can turn that off, though. And the permission to read from a user's photo library (to e.g. post images) includes the ability to write to it.