What you'll need: Apple Pencil and an iPad Pro.
With Apple Pencil you can mark up all kinds of things.
You can mark up a note by just tapping the Lock screen.
Mark up Mail attachments instantly.
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Mark up photos of a guy named Mark.
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You can even take a screen shot,
open it from the corner, mark it up,
tap the share icon, then AirDrop it.
And that's how to mark stuff up with Apple Pencil.
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Oh, hey! Look at that...