Continuity Sketch and Continuity Markup on your Mac
With Continuity Sketch, you can use your nearby iPhone or iPad to draw a sketch and instantly insert it into a document on your Mac—for example, in an email, a message, a document, or a note. Or use Continuity Markup to edit a document using your finger on an iOS device or with Apple Pencil on an iPad, and see those markups on your Mac.
Note: To use Continuity Sketch and Continuity Markup, you need an iPhone or iPod touch with iOS 13 or an iPad with iPadOS installed. Make sure your iMac and iOS or iPadOS device have Wi-Fi and Bluetooth turned on and are signed in with the same Apple ID. Pressure and tilt for Apple Pencil only work in apps with advanced stylus support.
Insert a sketch. In an app like Mail, Notes, or Messages, position the cursor where you want to insert a sketch. Choose File (or Insert) > Import from iPhone or iPad, then choose Add Sketch. On your iOS device or iPad, draw a sketch using your finger or Apple Pencil (on an iPad that supports it), then tap Done. On your Mac, the sketch appears where you positioned the cursor. Depending on where the sketch is inserted, you can mark it up or adjust other aspects, such as enlarge the size.
Mark up a document. With Continuity Markup, you can use a nearby iPad, iPhone, or iPod touch to mark up PDFs, screenshots, and images, and see the results on your Mac. Press and hold the Space bar to view the document in Quick Look, then click the iPad Markup icon 
. Start writing, drawing, or adding shapes with your finger or Apple Pencil (on an iPad that supports it). See the updates live on your Mac as you make them on your iPhone, iPod touch, or iPad.
Learn more. See Insert sketches with Continuity Sketch in the macOS User Guide and the Apple Support article Use Markup on your iPhone, iPad, or iPod touch.