With Continuity Camera and Continuity Sketch, you can draw a sketch, take a photo, or scan a document using your nearby iPad and have it appear instantly on your Mac, exactly where you need it—for example, in an email, note, or folder. You can also mark up a file on your Mac with your iPad using Continuity Markup.
You can use Continuity Camera, Continuity Sketch, and Continuity Markup with an iPad and Mac.
Make sure of the following:
Both devices have Bluetooth turned on.
Make sure that your devices are within 30 feet of one another.
Make sure your device meets minimum system requirements for Continuity Camera.