Access existing folders android

Hello,

I've been trying to access existing folders on an Android system by using various methods in C#.

Specifically, I want to access existing images on an Android system, and I'm first trying to access the folders in which they're saved.

The latest I have tried is Directory.Exists ("/sdcard/DCIM/Camera"). This seemed to work a few builds ago, but after changing the Android Manifest (adding ) this method also returns false.

I am building for android API 23. Player settings have been changed to write to external memory, even though I am not writing any data.

 DirectoryInfo dir = new DirectoryInfo("/sdcard/DCIM/Camera");


 public Text instruction;

 // Use this for initialization

 void Start ()
 {
     instruction = gameObject.GetComponent<Text>();
     instruction.color = Color.yellow;

     if (Directory.Exists("/sdcard/DCIM/Camera"))
     {
         instruction.color = Color.red;
     }

Are there any better, more reliable ways of accessing Android folders? Am I missing something?