Character falls through floor any suggestions?

Hey guys I’m VERY new to Unity3D, and I’m having a little issue. So I downloaded some free 3D Models from the Assets Store. I’m using one called “Robot Kyle” basically when I add him to my work space I add a Rigidbody to him and use gravity for him and place him a decent margin above the box I’m using as a floor, however the character goes right through the floor. As a test I placed a small cube with a Rigidbody also and it hit the floor perfectly. Can anyone explain what I can do.

P.S I’ve tried using a box collider on the character which slightly worked, but the physics would clearly be off.

Try to attach Box collider to floor and capsule collider to character and set isTrigger off for both. It should work