HTC One issues with sms notifications
I have an HTC One M7 running Android 4.4.2
I have searched all over for an answer to this, and haven't found anything definitive. I need my messaging app to have it's own separate notification sound, not part of the generic "notification sound" set up in settings/sound/notification sound. I have gone into the messaging app, selected settings/received messages: notification sound, and set the sound I wanted. When I get a page, I still just get the standard notification sound that is selected in my phone's settings.
I need a separate, LOUD, notification for sms, as I have on-call duties. I don't want to be woken up in the middle of the night for some useless notification. The generic response I have seen to similar posts is to download this app or that app. What I want to know is, if you can supposedly set a notification sound within the messaging app, why doesn't it work?