How can a mobile phone add its own watermark to a photo?

The following is the method of setting photo watermark for vivo mobile phone:

1. Turn on the camera-click "?" In the upper right corner. -Settings-Watermark-You can set the time, model and custom watermark;

2. Enter the camera-click the settings in the upper right corner and select "Photo Watermark/Time Watermark/Model Watermark" to open the saved photo, and the watermark will be displayed.