I have 5 wav files inside of sound/greetings.
Initially none worked and i had
S_StartSound(): Failed to load sound 'greetings\hello.wav'. File is missing from disk/repository.
I fixed it by adding */ in front of the file path.
Hello 2,3,4 and 5 are no longer showing missing from disk but now they simply don't play.
In above screenshot you can see that it doesn't return any errors for hello3 because it recognizes it exists in directory but it doesn't play the sound.
So because hello.wav works i tried making copies of it and then just renaming it but its still the same issue.