Collider/Volume for objects

Actually I am capable to create objects using maya and export to sansar.


However, the objects are always "phantom". Doing some random shots, I discovery that every mesh should have a volume inside the container. 


By opening the property of the container, you can choose between globe, square or mesh. How to upload the volume and attach it to the object ? Or the question could be: Can you give me a clue (simple clue..I can research on my own) about how to make Maya generate the collider for me so I can create a fbx package with the volume inside ?


Anyway...I can't find any kind of documentation about it.


Thanks in advance !


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