How to set personal notification tone on the Sonim XP7?

How do I set a personal text notification tone on my Sonim xp 7

Go to Messages > Settings > Notifications > choose the sound. If you can't see the one you downloaded, I suggest that you install file explorer apps like ES File Manager. This time, your phone will ask you which app to use when you are choosing sound, choose ES File Explorer then look for the notification you downloaded.

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