This YouTube link should hopefully help with what you're trying to do. Once you get all your notification tones you want, you'll be able to select them from the phone from this method. I always had a separate ringtone for my text messages, and a separate for everything other notification (e-mail, etc.)
https://www.youtube.com/watch?v=1SCiT-1bxYE
It's only 51 seconds, but here's how it goes:
-Tap on messages on main screen
-Hit the 3 vertical dots [...] on top right, and choose
settings
-In settings tap on
notifications
-
Enable notifications, then tap of
notification sound
Then from list you can choose which sound you want to customize JUST the tone for ALL text messages only.
Like I said, I like to keep my
text message notification tone separate from my
e-mail / other notification tones separate. Hope this helps someone out there
