How can I make my collisions exactly correct?

I am new to UE5 and have downloaded some free assets to mess around with. The asset in question is a mountain. When I try to create a auto convex collision using max hull count, verts and precision. I still get a poor collision, I understand that the mountain is very bumpy and hard to get an accurate collision automatically. So I am wondering If there is any way I can add more Collision in UE5 without using an external program.

In the static mesh editor, under collision, choose ‘use complex as simple’.

It doesn’t work. You can still walk through the rocks?
EDIT: Ive fixed it by turning off nanites

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