Download audios from Firebase (Android Studio)

Hello people from StackOverflow.

I am a student of an Android course and in classes we started to see how to work with Firebase. The fact is that I have managed to get my application to play a series of mp3 audio from the database, but now I would like to share it in another application, for this I have done this:

this.stRef  = FirebaseStorage.getInstance().getReference().child("audios/nombredelaudio.mp3");


File localFile = null;


try {
        localFile = File.createTempFile("nombreaudio", ".mp3");
        audiotempdescargado = localFile.getPath();
} catch (IOException e) {
    e.printStackTrace();
}

stRef.getFile(localFile).addOnSuccessListener(new OnSuccessListener<FileDownloadTask.TaskSnapshot>() {
    @Override
    public void onSuccess(FileDownloadTask.TaskSnapshot taskSnapshot) {
        Toast.makeText(getContext(),"creado",Toast.LENGTH_LONG).show();


    }
}).addOnFailureListener(new OnFailureListener() {
    @Override
    public void onFailure(@NonNull Exception exception) {
        Toast.makeText(getContext(),"fallo al crear"+exception,Toast.LENGTH_LONG).show();
    }
});

So far more or less well, I have been able to verify that the app downloads a temporary file while browsing from Android Studio, but when you pass it to another application with this method, it does not transfer anything:

Uri uri = Uri.parse(audiotempdescargado);
Intent share =  new Intent(Intent.ACTION_SEND,uri);
share.setType("audio/*");
c.startActivity(Intent.createChooser(share,"Compartir sonido en: "));

}

I followed the instructions given by the Firebase guide itself to download files, but I can not succeed ( link ).

Would anyone know where I can be failing?

Thank you very much.