Need help to save the Picture in Android phone

I have made a mobile application which needs to capture the picture and save it in android/iOS phone gallery. So far I can open the camera, can take a picture and save it in C drive of my system but I don't know how to save the picture in phone. can someone help?? So far I have done this.

using UnityEngine; using System.Collections; using System.IO; using System;

public class takeShot_trial : MonoBehaviour {

 public string deviceName;

 private WebCamTexture wct;

 public string path = "";


 IEnumerator Start(){





     WebCamDevice[] devices = WebCamTexture.devices;
     deviceName = devices [0].name;
     wct = new WebCamTexture (deviceName, 400, 300, 12);

     Renderer rend = GetComponent <Renderer> ();



     //For camera Authentication
     rend.material.mainTexture = wct;
     yield return Application.RequestUserAuthorization (UserAuthorization.WebCam);
     if (Application.HasUserAuthorization (UserAuthorization.WebCam)) {
         wct.Play ();

     } else {
         Debug.Log ("No Camera Found");
     }

     //For Photo Variables

 }




 void OnGUI() {      
     if (GUI.Button (new Rect (10, 70, 500, 100), "Click"))
         TakeSnapshot ();
 }

 string fileName (int width, int height)
     {
 return string.Format ("screen_{0}x{1}x_{2}.png", width, height, System.DateTime.Now.ToString ("yyyy-MM-dd_HH-mm-ss"));
 }





 void TakeSnapshot()
 {
     

     Texture2D snap = new Texture2D(wct.width, wct.height);
     snap.SetPixels(wct.GetPixels());
     snap.Apply();

     byte[] bytes = snap.EncodeToPNG ();

     string filename = fileName (Convert.ToInt32 (snap.width), Convert.ToInt32 (snap.height));
     Application.CaptureScreenshot ("Snapshot.png");
     path=Application.dataPath + "/Snapshot" + filename;



     System.IO.File.WriteAllBytes(path,bytes);


 }

}