Can I add a floor plan?

Yes, on every plan, the Free one included. On the Floor Plans tab (in the Advanced view), click Upload Floor Plan and choose a PNG or JPEG file of up to 5 MB; SVG files are not accepted. Pin each scene on the plan, then use Calibrate Radar so the cone on the map points the way the camera faces. Visitors see the plan as a small map in a corner of the tour, set up under Floorplan minimap on the Design tab (also in the Advanced view). Uploading and pinning do not reach visitors by themselves: click Save & Render on the Design tab afterwards (with Draft Workflows on, then Publish changes; my changes do not show has the rest). Add a floor plan and a minimap to a tour has the details.