Android : Notification sound for Android in Titanium Alloy

I am creating an android notification in Titanium-Alloy using benCoding Alarm Manager.

I read that for it to work my sound file should be in raw resource folder, so I manually created the ff. directory on the root of my project: platform/android/res/raw and placed my sound.mp3 inside it.

However, the sound is still not played when my local notification is fired. I also check if file exists but says it doesn't.

Additional detail: using default notification sound works when firing local notification.