Object Falls Through Cube

I am trying to add bottom thickness to an object. I create a cube and make the x and y dimensions the same as the object. But when I move the object above the cube, the object fall flat on the plate. It does not stay on top of the cube. Any ideas why?

Thanks.

You need to select both parts and assemble them. then you can move the cube up as far as you want to.

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Where is assemble. And is that different from Merge. I can move the part freely after merge but always when i let the mouse go it hits bottom.

Try making the object a part , rather than an object

Merge and Assemble are the same, just depends on what version of the Studio you are using.