How do i take a screenshot of an inverted iphone screen?

Whenever i try to screen shot the inverted screen the picture just shows up as the regular image in my camera roll. And i tried taking a picture of it with another phone but the reflection was too strong. I have an iphone 6s and if there's a way to do this Please Help

The inverted option isn't meant to be used in a screenshot.

There are many photo editing apps that could do the inversion after the fact though.

Rotate the photo in a photo editor.