For my game, I wanted to be able to chop down 3D trees, so I imported them from Unity’s standard objects. I already set up all the trees in my game and then I wanted to change the colliders a bit. But the problem is that it doesn’t let me edit the conifer tree Unity provides for free. It says since it’s an imported object it doesn’t allow me to make changes to the asset. Is there a way to edit imported objects, and if so how?
You edit assets in an appropriate external app. Text is edited with some sort of text editor, images are edited with Photoshop etc., 3D models are edit with Blender etc., and so on. Unity is not an asset editing app. (Aside from the built-in terrain system.)