Why doesn't Xiaomi's mobile phone rotate by hand?

Because this system doesn't work.

Xiaomi system does not have the function of saving pictures after rotation, but Shi Meiyu does.

In 20021year, Xiaomi submitted a new patent to the World Intellectual Property Organization, which showed the design of detachable rear camera. According to the patent report, the patent has a variety of rear camera module designs, including magnets, receivers, wireless transmission and other components, and adopts a detachable design. The detachable camera module can be attached to the top of the mobile phone through a magnet. The patent drawing shows two kinds of rear camera modules, round and oval, which may mean that the detachable design will be suitable for all kinds of camera modules.