On a phone: tap “View in AR”, then slowly move your phone so the camera finds the floor. Tap to place the platform — it appears at real size (about 10.7 m long, 2.2 m tall). Walk around it; drag with one finger to rotate, pinch to reposition. On a laptop/desktop: drag to rotate, scroll to zoom (AR is phone-only). iPhone/iPad uses the USDZ automatically; Android opens Google Scene Viewer (needs “Google Play Services for AR”).