How to take a picture of my iPhone Conversation?

How can I take a picture of my iPhone screen when it extends into one picture. Kinda like a panoramic.

Hold down the lock button that's on the top of the phone and double tap the back button on the front

You could use an app. For example, say you are going to use ifunny. If you screenshot each picture and set them so they relate to each other within the comic panels, you can have your screenshot look like it was taken on the iphone 26. Then, all you need to do is publish it, and then choose the option save to gallery.