item falling through floor after import

Hi, I have tried importing a .fbx item into my scene and if I add a rigidbody, it proceeds to fall down through the floor,

also I have downloaded the shadows demo to try and utilise the click on an object and move it around feature, and copied the same scripts that are on the other objects, and still cannot seem to select my object select it, could anybody shed any light, especially on the falling through the floor thing

Do you have colliders on the objects including the floor/scene?

There should be an option to generate colliders in the fbx import settings.

pretty sure that I do, I changed the options on the import settings in Unity to ‘Generate Colliders’ and also copied the exact same scripts that are on the other items, So as it stands the cxurrent order in the modifier stack is:

Animation (have tried it with/without animation)
Mesh Renderer
Rigidbody
Mesh Collider

Also I noticed that the table started dropping thoruhg the floor if I took Convex mesh off, but that doesn’t affect anything on my object