There is simply no way to add a 3D representation for Parts created as Electrical Package. Current the only way to attach 3D models seems to be with the SW plugin, which then requires the item to be of Assembly type. This leave Electrical engineers without a way of uploading models.
I propose that Upchain includes an "Upload 3D model" to the import selection for Electrical Package selection. This should be able to pass in at minimum STEP and IGES data types.
Similarly, It would nice to see this 3D models import feature for "Purchased Electrical Parts" which is commonly used for EE board level components.