Using the ‘Markup’ feature of iOS 12 Photos

In iOS 12, you can draw or type on any photo you take when using the Photos app.

Markup .jpg

Launch Photos, open a pic, and click the three-slider icon that opens up the editing options. From there, click the three-dot icon in a circle and choose “Markup.”

(This how-to is based on my experiences and info on Apple's support pages — where the images sometimes come from.)