Ionic Native File on iOS

Ionic Framework ionic-v3
1

Hi all, hoping for a bit of assistance on the Ionic Native File plugin.

I have installed the cordova plugin and referenced the Ionic Native component in a page. At the moment, I just run the following code in my page’s constructor:

this.platform.ready().then(() => {
            try {
                    alert(JSON.stringify(cordova.file));
            }
            catch (err) {
                this.alertBox("Error: " + err);
            }
}

To my confusion. when I run this on iOS via ionic view (that may be important), all the directories are null.
{
“applicationDirectory”:null,
“applicationStorageDirectory”:null,
“dataDirectory”:null,
“cacheDirectory”:null,
“externalApplicationStorageDirectory”:null,
“externalDataDirectory”:null,
“externalCacheDirectory”:null,
“externalRootDirectory”:null,
“tempDirectory”:null,
“syncedDataDirectory”:null,
“documentsDirectory”:null,
“sharedDirectory”:null
}

Can anyone give me an idea of what I might be overlooking here?