public async Task WriteFileOnInternalStorage(Context mcoContext, string fileName, string content) { var dir = new File(mcoContext.FilesDir, ""); if (!dir.Exists()) { dir.Mkdir(); } var gpxfile = new File(dir, fileName); var writer = new FileWriter(gpxfile); await writer.AppendAsync(new String(content)); await writer.FlushAsync(); writer.Close(); }