How to move assets from the "Engine" folder to the game folder

It is that. I am trying to move assets that I modified from the “engine folder” (Specifically a sky sphere material) to my current folder project but when I try to migrate I get an error that says “Engine assets cannot be migrated” Thank you to whoever has some clue.

I just duplicate the assets and move them into my folders, the engine content is built in, and can’t be changed, otherwise it can break the engine if you move the wrong things.