How to change notification tone - HTC one m9

[AC Question]

I have a HTC one m9 and I want to change my notification tone to a custom mp3 file as I don't like any of the default notification sounds. Specifically, I'm looking to change the text tone. So when I get a text I want the notification noise to be my custom mp3 file. How can I do this?

 

[B. Diddy]

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