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unity3d - How to retrieve data from sqlite db in unity where db file is present in downloads folder

I am trying to connect SQLite DB file to my unity project where db file is present in downloads folder but I am unable to get data from tables. How can I connect download folder contain DB file to unity project SQLite. My requirement is able to run a project with downloaded db file which is present in the downloads folder. Please suggest any idea. Thanks in advance. Here is the code I am using for connecting db file to SQLite.

Sample code :

        Debug.Log("Call to OpenDB:" + databaseName);

        var tempdbPath = Path.GetFullPath("log -29-10-2018 - .db");

        var tempdbbytes = File.ReadAllBytes(tempdbPath);

        var _filePath = tempdbPath;

        ApplicationContext.CurrentDatabasePath = _filePath;

        //open db connection
        _connectionString = "URI=file:" + _filePath;

(where _filePaht = /Users/deepak/Projects/testproject/test/log -29-10-2018 - .db)

        ApplicationContext.TempConnectionString = _filePath;

        ApplicationContext.ConnectionString = _connectionString;

        Debug.Log("Stablishing connection to: " + _connectionString);

        dbcon = new SqliteConnection(_connectionString);

        dbcon.Open();
    }
    catch (Exception exception)
    {
        LoggingManager.Error(exception);
    }
}

When I connect persistence folder contain db file it's working well, I am getting a problem when I am trying to connect db file present in the downloads folder.

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