Question how can I take pictures with AR Camera and save images? (android)

I am developing an AR Camera app (android) using Unity AR Foundation, how can I take pictures with AR Camera and save images?

If you click the button with the code below, I even took a screenshot of the screen, but the image file is not stored in a folder in the path you set. What should I do?

Code (CSharp):

1. public Camera camera;  
2.  
3. private int resWidth;
4. private int resHeight;
5. string path;
6.  
7. void Start()
8. {
9.     resWidth = Screen.width;
10.     resHeight = Screen.height;
11.     path = Application.persistentDataPath;
12.     Debug.Log(path);
13. }
14.  
15. public void ClickScreenShot()
16. {
17.     DirectoryInfo dir = new DirectoryInfo(path);
18.     if (!dir.Exists)
19.     {
20.         Directory.CreateDirectory(path);
21.     }
22.     string name;
23.     name = path + System.DateTime.Now.ToString("yyyy-MM-dd_HH-mm-ss") + ".png";
24.     RenderTexture rt = new RenderTexture(resWidth, resHeight, 24);
25.     camera.targetTexture = rt;
26.     Texture2D screenShot = new Texture2D(resWidth, resHeight, TextureFormat.RGB24, false);
27.     Rect rec = new Rect(0, 0, screenShot.width, screenShot.height);
28.     camera.Render();
29.     RenderTexture.active = rt;
30.     screenShot.ReadPixels(new Rect(0, 0, resWidth, resHeight), 0, 0);
31.     screenShot.Apply();
32.  
33.     byte[] bytes = screenShot.EncodeToPNG();
34.     File.WriteAllBytes(name, bytes);
35. }
36.