Issue with file download on iOS

# Bug Report

## Problem
I'm encountering an issue with the cordova-plugin-file plugin in iOS when trying to download and save a PDF file from an API response. The plugin seems to be working fine in Android, but I'm facing difficulties in iOS.

### What is expected to happen?
The PDF file should be successfully downloaded and saved to the device's filesystem in iOS, similar to how it's functioning in Android.

### What does actually happen?
Code runs successfully and falls under the success block and even present the toast of 'File downloaded successfully.' But file is not downloaded on device.

## Information

### Command or Code

```
downloadPdfMobile(base64Data, fileName) {
const folderPath = this.platform.is('android')
? this.file.externalRootDirectory + 'Download/'
: this.file.documentsDirectory;

console.log(folderPath, 'FOLDERPATH');

// Convert base64 to Blob
const byteCharacters = atob(base64Data);
const byteNumbers = new Array(byteCharacters.length);
for (let i = 0; i < byteCharacters.length; i++) {
byteNumbers[i] = byteCharacters.charCodeAt(i);
}
const byteArray = new Uint8Array(byteNumbers);
const blob = new Blob([byteArray], { type: 'application/pdf' });

// Write the file
this.file
.writeFile(folderPath, fileName, blob, {
replace: true,
})
.then(() => {
this.presentToast('File downloaded successfully.');
console.log('File downloaded successfully.');
})
.catch((error) => {
this.presentToast('Error while downloading the file:');
console.error('Error while downloading the file:', error);
});
}
```

### Environment, Platform, Device

### Version information

Cordova Version: 12.0.0

## Checklist

- [x] I included all the necessary information above
- [x] I searched for existing GitHub issues
- [x] I updated all Cordova tooling to most recent version

Start by reproducing downloadPdfMobile with cordova-plugin-file on iOS, focusing on the documentsDirectory path and the writeFile success callback. Verify where the PDF is saved and whether it can be found or opened; done means the downloaded PDF is present on the iOS device, with the relevant environment and device details recorded.

Written by the indexing model from the issue text.