Yup, iOS' pre-loaded Mail app lets you draw on and add text labels to image attachments. You may also save your signature and imprint it onto an image or a scanned document, perhaps. Here's how you do all that.
Okay, now you should be in a whole new screen with your image in the middle and a bunch of buttons at the bottom. By default, the brush is highlighted and ready to be used with a color of your choice. At this point, you are free to draw onto the image using your fingers. Note that if you doodle a shape that the app can recognize – a circle, a line, or an arrow, for example – you may have it straightened automatically. Tapping on a drawn object lets you delete it or scale it by dragging one of the blue dots that appear.
The second button in the tools panel lets you enlarge a portion of the image, as if it was under a magnifying glass. You may move the magnifying glass by dragging it around. Sliding the blue dot outward makes the magnified area larger. As for the green dot, it determines the zoom level. Again, if you tap on one of these magnifiers, you'll be given the option to delete it.
We've come to the third button in the tools menu, which is used to adding text labels. Simply tap on the label to edit it. If you tap on the "aA" symbol that appears, you'll be allowed to change the size and font of the text, as well as its justification. There doesn't seem to be a way of adding a background color, but a clever use of the brush can rectify that.
And finally, the fourth button in the tools panel is for adding your signature to the image. This might come in handy if you're sent a scanned document that you need to sign. The cool thing about the signature is that it is saved for future use.
So, that's how you edit image attachments in Mail for iOS 9. Do you see yourself using this feature often? Let us know in the comments!