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In Flutter, you can write files to external storage using the path_provider package. This package gives you access to device directories like documents, downloads, and external storage.

First, add the path_provider package to your project by adding the following line to your pubspec.yaml file:

path_provider: ^^2.0.1

Then, import the package in your Dart code:

import 'package:path_provider/path_provider.dart';

To write a file to external storage, use the getExternalStorageDirectory method to get the path to the external storage directory, and then use the Dart File class to write the file:

// Get the directory for external storage
Directory directory = await getExternalStorageDirectory();
String path = directory.path;

// Define the file name and content
String fileName = "my_file.txt";
String fileContent = "Hello, world!";

// Create a File object and write the content to it
File file = File('$path/$fileName');
await file.writeAsString(fileContent);

This code gets the external storage directory using the getExternalStorageDirectory method, which returns a Directory object representing the root of the external storage directory. It then defines the file name and content, creates a File object using the path and file name, and uses the writeAsString method to write the content to the file.

Note that you'll need to request the WRITE_EXTERNAL_STORAGE permission in the AndroidManifest.xml file of your app to write to external storage.