Update and render a SkyBox Texture

I have been following these tutorials because I want to create a “game” that changes 360 photos that are on a skybox as a texture. In other words, having only one skybox but different photos as you “move forward”.

These tutorials show how to make a cubemap and how to create a skybox with spacescape but when I try to place the cubemap as a material it appears to be a cube and not a sphere.

Is there any way to change the skybox textures when pressing the arrow keys and how will i fix the cubemap situation? Thank you