Add a 3d model to the scene

Is it possible to add a 3d model to a scene after you have been working in the scene?

You can only add new 3D models in a 3D modeling program that you originally used to create the model. After doing so, do not export the model as a new scene, but update the existing scene. This way changes already done in the Shapespark editor are preserved so you don’t need to redo your work (you will need to bake the lightmap again, as geometry changes invalidate the lightmap).

Makes sense, thank you