Set a Custom Ringtone from Your Own Audio Files
If the default ringtones on your Realme phone all sound the same, you can swap them for a song or audio file you already have on your device. On Dual SIM phones, you can also assign a separate tone to each SIM card, which helps you tell work calls apart from private ones just by the sound. This does not require any extra app.
Set Custom Notification Sound
If the built-in notification tones on your realme phone all sound the same, none of them may match what you actually want to hear when a message arrives. Realme UI lets you pick your own mp3 file as a notification sound, but it only shows up in the sound picker once it sits in the right place on the device. Storing the file in the wrong folder or using an unsupported format is the most common reason a custom tone never appears in the list.