appwrite/app/sdks/client-flutter/docs/examples/storage/get-file-preview.md

import 'package:appwrite/appwrite.dart';

void main() { // Init SDK
  Client client = Client();
  Storage storage = Storage(client);

  client
    .setEndpoint('https://[HOSTNAME_OR_IP]/v1') // Your API Endpoint
    .setProject('5df5acd0d48c2') // Your project ID
  ;

  String result = storage.getFilePreview(
    fileId: '[FILE_ID]',
  );

  print(result); // Resource URL string
}