How to customize the skybox?

### Before Creating the Enhancement Request - [x] I have confirmed that this should be classified as an enhancement rather than a bug/feature. ### Is your feature request related to a problem? yes, i have searched for this, but the responses just lead to the asset overlay link, that had no specific tutorial on how to get a custom tex file. same thing for particles ### Describe the Solution you'd Like Adding compatibility for custom particles and skyboxes on asset overlay ### Describe Alternatives you've considered i tried to use asset overlay for particles, but it only works on cursors. ### Additional context _No response_