Cube falls through custom plane

Unity Engine
1

So im trying to figure out why my cube (player) wont stop falling through my ground (custom low poly plane from blender). My Cube got the mesh colllider and ive tried like 5 diffrent colliders on my ground but it keeps on falling through!!
Ground:
5800372--613108--upload_2020-5-4_10-8-24.png
Cube:
5800372--613111--upload_2020-5-4_10-8-42.png

2

For the cube, use a box collider instead of a meshcollider (although it will also work) but you need to check the convex flag on your mesh colliders.

3

You also need a RigidBody in some of your colliding objects in order for the collision to register. So check that too.