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It keeps falling through the floor.
On the object I added a Rigidbody and it already has a box collider.
And the floor:
I want to make a bouncing ball effect. I'm using the official unity tutorial:
However, my object falls through the floor.
Check the floor collider. Add a box collider to the floor, remove the mesh collider, and check the result. The floor may have wrong mesh orientation. Or just try turning the floor 180 degrees along the relevant axis.
There can be issue to the layers.
Here you can check out edit->Project settings->physics. See there which layer is colliding and which is not.