flutter - flutter_plugin_pdf_viewer를 사용하여 Google 드라이브에서 PDF 파일을로드 할 수 있습니까?

시도했지만 pdf 파일이로드되지 않습니다. 이것은 내 코드입니다

import 'package:flutter/material.dart';
import 'package:flutter_plugin_pdf_viewer/flutter_plugin_pdf_viewer.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
  bool _isLoading = true;
  PDFDocument document;
  @override
  void initState() {
    super.initState();
    loadDocument();
  }
  loadDocument() async {
    document = await PDFDocument.fromUrl('https://drive.google.com/drive/u/0/folders/1ei6916qmZ34LZECNf5e0DlvB7EJqxqz8');
    setState(() => _isLoading = false);
  }
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(  
        appBar: AppBar(
          title: const Text('PDF FILE'),
        ),
        body: Center(`enter code here`
            child: _isLoading
                ? Center(child: CircularProgressIndicator())
                : PDFViewer(document: document)),
      ),
    );
  }
}