How to write file in iPhone's photo directory using cordova-plugin-file?

Hello everybody. I would like to png file in iPhone’s photo directory. But I can’t wirte.
My code.
$cordovaFile.writeFile(cordova.file.documentsDirectory + ‘test_png’, ‘Some text te test filewrite’, ‘’).then( function(result) {
});
Operation is success. But I can’t find the file. Please tell me absolute path of iPhone’s photo directory.
Regard.

Hi, I’m not an expert on iPhones, but have you tried looking in the directory, that is listed in this table: http://ngcordova.com/docs/plugins/file/ ?
Imho, the full path of the cordova.file.documentsDirectory should be /var/mobile/Applications/<UUID>/Documents/

ios is very stricted OS. You can use only application directory only?