Unable to create cubemap

Hello People! I m newbie in UE4. I have a BIG tri=ouble with Creating cubemaps for Enviroments (spacesky). I used 3d max for rendering 6 images for cubemap. When i placed them in Photoshop.
Its very ugly and crasy result. Where i mistaked? Please HELP!

Hi!

This is several tutorials about how to create Skybox.

https://youtu.be/JSRsQpRfDlk

tnx good link, i was using AMD ModifiedCubeMapGenerator it was done around 2011 and didnt know you had to change it in Nvidia to 8888, real mess.
now it is a lot easier photoshop to dds to nvidia import ue4