Major Bug In Modeler -- Importing 3D .OBJ from Illustrator -

I created a simple 3D object in Illustrator, and then imported that .obj

into Adobe 3D Modeler.  I then created a simple cylinder in Modeler and tried to

cut a piece out of that 3D model from Illustrator.  Doing so stops Modeler from doing anything,

there is NO error message, no repsonse of any kind. Trying to cut the 3D model out with the cylinder

doesn't work.  Seeing this model was created in an Adobe product, one would think this would work.

It doesn't.   P.S. - where's the layers panel in 3D Modeler ?  .... nowhere to be found.  If you can create a "new layer" why can't I find the layers panel ? - posted this yesterday,  where are the Adobe staff ? Looks like nobody monitors this forum. Is Modeler being discontinued ? I hope not.