Altium Import 3d Model. Once the pcb panel has been opened select the 3d models option from the drop down menu at the top of the pcb panel to enter 3d models mode. A 3d body pop up window will appear.

A 3d body pop up window will appear. The generic 3d model section of the following 3d body dialog offers three alternative source options for importing a step files. Once the pcb panel has been opened select the 3d models option from the drop down menu at the top of the pcb panel to enter 3d models mode.
The step model is then loaded into the 3d body using the vault or embedded import option as detailed above.
Browsing 3d models as you click on a specific component in the components region of the panel filtering will be applied using the component as the scope of the filter. Once the pcb panel has been opened select the 3d models option from the drop down menu at the top of the pcb panel to enter 3d models mode. Vault browse to a connected altium vault and select a 3d model file revision. A 3d body pop up window will appear.