Imported my Rhino SAT but Revit won’t make Mass Floors from it

Almost certainly the SAT was imported OUTSIDE the Mass Editor — that’s the classic trap, and those imports never get Mass Floors. The correct order: Massing & Site → In-Place Mass, name it, and only then Insert → Import CAD from INSIDE mass mode (positioning Internal Origin, units centimeters), then Finish Mass. Also make sure the Rhino solid is watertight — open or bad geometry breaks floor generation too. Full steps: Import sat mass →