There's a chance that you've seen—and probably ignored—a marker tip icon equally y'all use your iPhone. Apple tree get-go introduced the Markup characteristic, a built-in function represented past this icon, in iOS x. The photo notation tool basically allows you to draw on photos and PDF files beyond diverse iPhone apps. Allow'due south see how you can apply and maximize the Markup feature on your iPhone or iPad. 1. Annotate Emails in Mail In the Mail app, you tin apply Markup past composing a new e-mail or in a answer to an existing email. There are diverse ways to access the Markup feature, depending on what y'all want to do. If y'all want to add a drawing: Select the torso of the e-mail, then tap the < push button on the right side of the keyboard. From the new row of icons, tap the