How to create a skybox/cubemap in Studio?

I have an image like this and I want to make it the background. How can I do that in Studio?

It should be in the same format as an HDRI, like a 360 camera. Here’s a good example:

btw: The above link is a great place for free skyboxes to use.

Ok and then I just use it as texture for a box in Studio? The thing is that I only want the sky not the ground? So I used alpha in a png to erase the bottom part of the HDRI but if I apply it to a cube it doesn’t wrap correctly. Do you know ways around that?

It works pretty well if you use the built-in Skybox config options, since the built in Skybox is a Sphere not a Cube.