How to load a already saved png from an IOS path?

I have already saved an image as a png file.The code for saving is given below

Code (CSharp):

1.  Texture2D tex2d = (Texture2D)textures;
2.         var bytes = tex2d.EncodeToPNG();
3.         //IN assets folder
4.        // var dirPath = Application.dataPath + "/../SavaImages/";
5.         var dirPath = Application.persistentDataPath;
6.         if(!Directory.Exists(dirPath))
7.         {
8.             Directory.CreateDirectory(dirPath);
9.            
10.         }
11.  
12.         File.WriteAllBytes(dirPath + "img.png", bytes);

Now I am trying to load the same png image into a Rawimage.When I test my app in unity editor it is working but when testing it in IOS device the raw image does not change its image.

Code (CSharp):

1. public RawImage img1;
2. Texture2D tex1 = null;
3.             byte[] fileData;
4.  
5.             //string filePath=  Application.dataPath + "/../SavaImages/img.png";
6.             string filePath = Application.persistentDataPath+"img.png";
7.  
8.             if (File.Exists(filePath))
9.             {
10.                 fileData = File.ReadAllBytes(filePath);
11.                 //tex = new Texture2D(2, 2);
12.                 tex1 = new Texture2D(150, 150, TextureFormat.DXT1, false);
13.                 tex1.LoadImage(fileData);   //..this will auto-resize the texture dimensions.
14.                 img1.texture = tex1;
15.             }
16.  

.I tried other path also but same result working in unity editor but not in IOS device
string filePath= Application.dataPath + "/../SavaImages/img.png"

 

You're setting the texture format to Dxt1, I think you need to use one supported by iOS.