Unity export uses the selection sets created on import to determine which objects to export. If you add a new object to the Model, you must also add this new object to the Model’s UnityExportSet set.

Use the Unity Integration tool in 3ds Max Work in 3ds Max to import FBX files from a Unity project and re-export them after editing.

Unity Technologies Collaborates With Autodesk to Strengthen Link With Autodesk 3ds Max and Maya Collaboration enables FBX files to work more directly with the world’s most popular creation engine ...