Are you on Android 8.0 (Oreo)? After the Android 8.0 update, Samsung removed the option to add a custom text message tone for each contact. The only recourse now is to use a different text message app.
Are you on Android 8.0 (Oreo)? After the Android 8.0 update, Samsung removed the option to add a custom text message tone for each contact. The only recourse now is to use a different text message app.