How did Huawei shoot the starry night scene?

Huawei's method of shooting starry night scenes is as follows:

Tools: Huawei nova8, HarmonyOS system 2.0.0.

1, first under the camera, there is a choice under the camera, and then click the night view.

2. In night mode, set ISO and S to automatic.

3. Click the white button to shoot the starry sky.