My character keeps falling through floor

I have a character that I downloaded from free assets in store. It has a rigidbody and a capsule collider. The floor is a platform from the standard assets and it has a box collider on it. My character keeps falling through the floor. I checked "is kinemtic" which stopped it from falling through but now it walks through objects. Is there a way to stop it from falling through the floor without using the kinematic option?


It is not positioned below the platform nor is the capsule collider.