create a text file in my android device

I am working on a project where i want to create a text file on my android device and update it every time i open the app it works fine with win but when i build it on my device it didn't work ,didn't create text file but also there is no error
note: i already tried application.persistentdatapath but still the same

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using System.IO;
 
 public class Main : MonoBehaviour {
  
 
     void CreateText() {
         //Path of the file
         string path = Application.dataPath + "/Log.txt";
         //Create File if it doesn't exist
         if (!File.Exists(path)) {
             File.WriteAllText(path, "Login log \r\r\n");
         }
         //Content of the file
         string content = "Login date: \r\r\n";
         //Add some to text to it
         File.AppendAllText(path, content);
     }
 
     // Use this for initialization
     void Start () {
       
 
         CreateText();    
     }
     
     // Update is called once per frame
     void Update () {
         
     }
    
 
 }
 

What i am missing here?