Problem with Write Access

Hello,

I'm developing an app using SQLite database and i had some issues with access this db on Android, but i got it and it works. The problem now is that my app is crashing whenever i try to run it on my device or any other device (sometimes it works). BUT i think i found the root of the problem. When i try to do the build with "Write Access" -->"External (SD Card)" the app crashes, but when i build with "Write Access" --> "Internal Only" the app does not crashes anymore, but i also can not acces the database and i have no idea why it happens.

the code blocks below where working just fine after the change mentioned:

here i copy the db to Android persistentDataPath folder:

 void Awake()
     {
         filePath = Application.persistentDataPath + "/MGDB.db";
 
         Debug.Log (filePath);
 
         //print(filePath);
 
         //if(!File.Exists(filePath))
         //{
 
         loadDB = new WWW("jar:file://" + Application.dataPath + "!/assets/MGDB.db");
 
         while (!loadDB.isDone)
         {
         }
 
         File.WriteAllBytes(filePath, loadDB.bytes);
         //}
     } 

and here i connect to the db:

 if (Application.platform == RuntimePlatform.Android)
         {
             connection = (IDbConnection)new SqliteConnection("URI=file:" + Application.persistentDataPath + "/MGDB.db");
             connection.Open();
             command = connection.CreateCommand();
             //print("android");
         }

Have you any idea about this anomaly?