change notification ringtone on lg g4

[Android Central Question]

I am trying to change my message ringtone on my lg g4 phone using Zedge. My call ringtone has changed ok but my messaging ringtone, although when I go into my settings it says it should be changed, just won't come up. Can anyone help.

 

[ManiacJoe]

LG g4

Which version of android?
Which carrier?
Which messaging app?