add a new function in the "Camera Assistant" app to allow users to add three custom magnification buttons. For example, I often use the three focal lengths of 1.5x, 5x, and 20x. You can set it yourself in the "Camera Assistant", and then when we use it, just click the corresponding magnification button directly on the camera. In this way, we don't have to go to the camera to manually set the magnification every time, which is time-consuming and difficult to be accurate.