How do Samsung SMS and WeChat set different letter sounds?

Method of setting SMS ringtone on mobile phone;

Mode 1: information-more-settings-notification-slide on-prompt tone-just select the required ringtone;

Method 2: If you need to customize the SMS ringtone, save the song to the Notifications folder under the root directory (if not, please create a new one), and then set it according to the path of method 1