After you’ve created a custom environment for Windows Mixed Reality and saved it in GLB format, test it by installing it on your PC (in SkySpaces, click on “Advanced” and use the “Add” function in the panel on the left). Then open the Mixed Reality Portal, tap on “Places” in the Start menu, and select your new environment.
Once you’ve tested your new environment, upload it below to add it to the SkySpaces gallery.