Why doesn't Mate 8 support setting notification ringtones separately from SMS ringtones?

Support, which needs to be set separately on the dial-up and SMS pages.

Set the ringtone as follows: turn on dialing, turn on >? Settings? & gt？ Call ringtone, set the system ringtone or saved music as the call ringtone. You can also click Settings? & gt？ Sound, and then click the settings item under the ringtone and vibration area to set the ringtone.

Set the SMS ringtone as follows: open the message, and in the message list interface, click >? Settings? & gt？ Notification bells and vibrations. Click the notification bell. If it is a dual-card device, click the card? 1? Notification bell or notification card? 2? Notification ringtone: Set the system ringtone or saved music as information notification ringtone.