Click on the AR icon in the upper right corner of any picture. Wait for the reaction of your phone, allow your browser to use the camera, then click "View in your space".
The phone will prompt you to twist the camera several times from side to side so that it finds horizontal surfaces in the frame.
That's all, now the object should appear. It is surrounded by a white square and you can interact with it: make it larger or smaller, rotate and move. Now it's up to you - place the object in a suitable place. You can take both photos and videos. Finished files are saved to the gallery.