Marking Up Email Attachments on Your iPhone
If you’re attaching a photo or a PDF document to an email message on your iPhone, you can take advantage of the Markup feature. With the picture attachment or PDF embedded in your outgoing message, tap and hold down or double-tap the attachment; then tap Markup from the share menu that appears.
You can summon the Markup feature also when you receive a PDF or picture attachment. Tap the attachment and then tap the Markup tab that appears adjacent to Select, Select All, and Paste.
Now that you’re in markup mode, you can draw on that image or PDF, tapping the simple annotation tools just below it.
The tools are represented by drawing icons, including pen, highlighter and eraser. (Unless you use an optional stylus, your finger will be that pen.) There’s also a magnification loupe so that you can zoom in on the document or pic, and options to write text (you can summon the keyboard) and to draw with your signature.
If you draw a shape such as an arrow and the iPhone recognizes that that was the shape you had in mind, it will give you the option to draw it for you. One piece of advice on that arrow business: Draw with a single stroke and do not lift your finger. You can leave your own imperfect arrow (or other symbol) if you prefer to use that one instead of Apple’s version.
Within Markup, you have the option to change the color and thickness of the lines and symbols you draw.
Lastly, you can write your signature in script, a potential boon for lawyers or folks needing to get a John Hancock on a contract or lease. Tap the circled + and then tap Signature. You can tap an existing signature if you’ve already created one. Or tap Add or Remove Signature, tap the + in the upper-left corner of the screen, and sign your name with your finger.
As part of iOS 11, Apple lets you draw inside an email (using Markup tools) as well. In the same way that you access options to format mail, add attachments, and such, keep tapping the right arrow until you get to Insert Drawing. Tap Insert Drawing and use the tools until you’re satisfied with your artwork. Tap Done to insert the drawing into your email draft. As with a picture attachment, choose an appropriate size before you tap Send.