Unity: Custom Procedural Skybox disappears at build

问题

Following this process https://www.youtube.com/watch?v=UIbkfVWYRWQ

I made a custom skybox procedural material for my app and applied it in the lighting panel.

It works fine but when I make a build for Android, during the building process, the custom skybox is replaced with the "Default-Skybox"

Once the build is done, the custom skybox comes back

I found that https://answers.unity.com/questions/1211015/procedural-skybox-no-longer-working-on-android-bui.html

But I can't find how to "Delete the shader from the standard asset package"

来源：https://stackoverflow.com/questions/57803829/unity-custom-procedural-skybox-disappears-at-build