How to set the flash to always on?

Turn the flash on or off: When taking pictures in a dim environment, you can turn on the flash to increase the brightness of the environment. In the camera interface, click to switch between the following four modes:

Automatic: the camera automatically judges whether it is necessary to turn on the flash according to the ambient light.

Off: Don't turn on the flash when taking pictures.

On: Turn on the flash when taking pictures.

Always on: The flash is always on in the shooting interface.