connecttoFS does not work with files written to SPIFFS

[JorisSneagle]

I am trying to play an audio file that I have written to SPIFFS but it won't play with connecttoFS() I have confirmed that writing to SPIFFS works by writing a text file to SPIFFS and then printing it to the console but when I try the same with an .mp3 or .wav file and using connecttoFS() it does nothing

#include "Arduino.h"
#include "Audio.h"
#include "SPIFFS.h"
#include "FS.h"

#define I2S_DOUT     25
#define I2S_BCLK      27
#define I2S_LRC        26
Audio audio;

void setup() {

  audio.setPinout(I2S_BCLK, I2S_LRC, I2S_DOUT);
  audio.setVolume(10);
  audio.connecttoFS(SPIFFS, "test.mp3");

}

void loop()
{

  audio.loop();

}

Thanks in advance.