Assembly of sub assemblies

Hi, I’m trying to define an assembly created from sub assemblies. The modeling of the first assembly worked fine but when trying to use it to create a step in a new assembly product, the visualization in the editor only shows a cube (even when defined to only accept specific product type)
Has anyone else encountered this issue?

Thanks

Sub-assemblies are only visualized with the cube since you can’t be sure what steps the sub-assembly might have. Thus, you can set the cube to roughly cover the same space as your sub-assembly.