Originally Posted by jamisles02
I just checked the file location & I have it in the Device Storage in the Notifications section. Is this the correct folder for them to be in & the file type is .mp3
That's the correct folder.
Would you be so kind to upload that mp3 for us to test? Or perhaps try another one from place like Notification Sounds - Download free ringtones, notification sounds, message tones and more
It could be the type of mp3 that you used and not the phone's generic problem.
All my notifications come from the above URL, and they all work very well.
Give it a try, by setting a new contact with your own number and custom notification sound. Then text yourself and quickly off the phone using the power button. Await the arrival of the message and see if it works.