Realme
Change Alarm Sound auf Realme
Realme UI treats the alarm sound as its own category, independent from the ringtone and notification tone you set in the general sound settings. Changing the ringtone has no effect on how your alarms sound, which is why many users end up looking in the wrong menu first.
Every alarm you create in the Clock app stores its own sound setting. That means one alarm can use a built-in tone while another plays a song from your music library, which is useful if you need a louder or more distinct sound to actually wake up.
Where to change it
Open the Clock app and go to Tap on Clock ➔ Choose an Alarm ➔ Tap on Ringtone ➔ Select from files or choose a Ringtone ➔ Tap on Back ➔ Tap on Save.
Picking a song or MP3 file works the same way as selecting a built-in tone, just tap Select from files instead of one of the preset ringtones. Confirm with Tap on Save so the new sound is applied to that specific alarm only.