Apple made Continuity, its system that lets you pick up where you left off on other Apple devices, much more powerful in macOS Mojave with a new feature called Continuity Camera.
In macOS Mojave, if you're working on a document on your Mac, and want to include a photo, it can automatically activate the camera on your phone.
And when you snap that photo, it automatically appears in the document on your Mac. This works for documents and receipts, in case you need a quick PDF, and works in a variety of Apple apps, including Mail, Notes, Pages, Keynotes, Numbers, and more. This feature could be a huge time-saver for many.