HOW TO Draw and edit with Markup
1 Pick your app
Many of Apple’s own apps are Markup–enabled — in Photos if you edit an image you’ll see an icon of a circle with three dots in it. Click that and you’ll see the icon for Markup, which is a circle with a pencil inside it.
2 Markup quickly
The fastest way to access Markup is from your desktop or inside a folder: select it and tap the Spacebar to bring up the Quick Look window with your file inside it. Click the Markup icon.