GVRAudioEngine: Can't play audio files from external Storage.

[sarathsi]

VR sdK: com.google.vr:sdk-audio:1.190.0

I am trying to play audio files from devices /sdcard/, but createSoundObject() & createSoundfield() both are failing with / without preloadSoundFile().

final File file = new File(Environment.getExternalStorageDirectory(), "HelloVR_Loop.ogg");
// file path in the device:  "/storage/emulated/0/HelloVR_Loop.ogg"
final String filename = file.getAbsolutePath();
mGvrAudioEngine.preloadSoundFile(filename);
...
int soundId = mGvrAudioEngine.createSoundObject(filename);

soundId is INVALID_ID.