Application.persistentDataPath+"/playerinfo.dat" not saving in ipad but working in editor

I have this save function to save the file and load function to load it. I followed the tutorial https://unity3d.com/learn/tutorials/topics/scripting/persistence-saving-and-loading-data.

The code works in the editor and android devices but when build to ipad it does not work

 public void Save(){
 BinaryFormatter bf = new BinaryFormatter();
 FileStream file = File.Create(Application.persistentDataPath+"/playerinfo.dat");
 
 PlayerData data = new PlayerData();
 data.starscore=starscore;
 data.language=language;
 data.unlockLearn = unlockLearn;
 data.unlockPlay = unlockPlay;
 data.unlockChallenge = unlockChallenge;
 data.rateApp = rateApp;
 data.autoplay = autoplay;
 data.elephantscore=elephantscore;
 data.lionscore=lionscore;
 data.pandascore=pandascore;
 data.tigerscore=tigerscore;
 data.level2=level2;
 data.level3=level3;
 data.level4=level4;
 data.level5=level5;
 data.level6=level6;
 data.level7=level7;
 data.level8=level8;
 data.xtrablock=xtrablock;
 data.screentimer=screentimer;
 data.savedtimermin=savedtimermin;
 data.countdown=countdown;
 data.savedtimerhr=savedtimerhr;
 data.sec = sec;
 data.min = min;
 data.hrs = hrs;
 data.locked=locked;
 data.firstplay=firstplay;
 bf.Serialize(file,data);
 file.Close();
 }
 
 public void Load(){
 if(File.Exists(Application.persistentDataPath+"/playerinfo.dat")){
 BinaryFormatter bf = new BinaryFormatter();
 FileStream file = File.Open(Application.persistentDataPath+"/playerinfo.dat", FileMode.Open);
 PlayerData data = (PlayerData)bf.Deserialize(file);
 file.Close();
 starscore = data.starscore;
 language = data.language;
 unlockLearn = data.unlockLearn;
 unlockPlay = data.unlockPlay;
 unlockChallenge = data.unlockChallenge;
 rateApp = data.rateApp;
 autoplay = data.autoplay;
 elephantscore=data.elephantscore;
 lionscore=data.lionscore;
 pandascore=data.pandascore;
 tigerscore=data.tigerscore;
 level2=data.level2;
 level3=data.level3;
 level4=data.level4;
 level5=data.level5;
 level6=data.level6;
 level7=data.level7;
 level8=data.level8;
 xtrablock=data.xtrablock;
 screentimer=data.screentimer;
 savedtimermin=data.savedtimermin;
 countdown=data.countdown;
 savedtimerhr = data.savedtimerhr;
 sec = data.sec;
 min = data.min;
 hrs = data.hrs;
 locked = data.locked;
 firstplay = data.firstplay;
 }
 }
 }