How to make and add a custom skybox?

Can I design my own sky layout and import it into unreal? Also, what software should I use to make this if I can. How do use the created image to change the image of the sky?

This is how to create a basic one: https://juarez3d.files.wordpress/2011/06/tutorial_animated_skydome_v1-3.pdf (just take a look at chapter 1 & 2) :slight_smile:

that link does not load a website for me.