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smexportonshape function in matlab2021a does not export mass properties of standard content

I am trying to perform a dynamic simulation on matlab from an assembly that I created. It has a bunch of bolts, and when I export the assembly with the smexportonshape() function on matlab it exports everything correctly, but the mass properties of the standard content do not export.

I think matlab grabs this information from the part studios and since there is no part studio (at least at simple view) of the standard content, maybe thats the reason it fails.

My standard content has material defined in the assembly, when I look up the mass properties it correctly displays in onshape. But the export command with matlab fails to export this as I previously stated.

I figure out that I can modify the matlab script that has all the properties, but I wanted to know if there is another simpler way.

One last note, when I fasten parts in an assembly, later in simscape (or any structural/dynamic/etc. simulation software) they will be "welded" in their entire overlapping surface? Or I need to fasten then just with bolts? I do not have that clear. Since I want to simulated the stress in the actual joints points (bolts fastening to rigid bodies, not two rigid bodies glued together).

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