Videos not getting added to list using imagepicker and getting displayed

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Dart

Flutter

I am trying to upload videos to firebase before that I am trying to display them in the app in listview but they are not getting displayed on the screen, there is'nt any error messages in debug console either so I am unable to figure out what is the issue; My upload video button which uploads videos to firebase is also not functioning so I think maybe videos are not adding to the list Add_video_screen class :

class addVideo extends StatefulWidget {
  const addVideo({Key? key}) : super(key: key);

  @override
  _addVideoState createState() => _addVideoState();
}

class _addVideoState extends State<addVideo> {
  bool uploading = false;
  double val = 0;
  CollectionReference? vidRef;
  firebase_storage.Reference? ref;
  File? video;
  VideoPlayerController? videoPlayerController;

  final picker = ImagePicker();

  Future pickVideo(ImageSource source) async {
    final Video = await picker.pickVideo(source: source);

    video = File(Video!.path);

    videoPlayerController = VideoPlayerController.file(video!)
      ..initialize().then((_) {
        setState(() {});
        videoPlayerController!.play();
      });
  }

  List<File> _video = [];
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Add video'),
        actions: [
          ElevatedButton(
            onPressed: () {
              setState(() {
                uploading = true;
              });

              uploadFile().whenComplete(() => Navigator.of(context).pop());
            },
            child: Text(
              'Upload Video',
              style: TextStyle(color: Colors.red),
            ),
          )
        ],
      ),
      body: ListView.builder(
          itemCount: _video.length + 1,
          itemBuilder: (ctx, index) {
            return index == 0
                ? Center(
                    child: ElevatedButton(
                        onPressed: () {
                          !uploading ? chooseVideo() : null;
                        },
                        child: const Text(
                          'Test',
                          style: TextStyle(color: Colors.black),
                        )),
                  )
                : AspectRatio(
                    aspectRatio: videoPlayerController!.value.aspectRatio,

                    // child: VideoPlayer(videoPlayerController!),
                    child: VideoPlayer(
                        VideoPlayerController.file(_video[index - 1])
                          ..initialize().then((_) {
                            setState(() {});
                            videoPlayerController!.play();
                          })),
                  );
          }),
    );
  }

  chooseVideo() async {
    ImagePicker picker = ImagePicker();

    final pickedFile = await picker.pickVideo(source: ImageSource.gallery);

    setState(() {
      _video.add(File(pickedFile!.path));
    });
    videoPlayerController = VideoPlayerController.file(File(pickedFile!.path))
      ..initialize().then((_) {
        setState(() {});
        videoPlayerController!.play();
      });
    if (pickedFile.path == null) retrieveLostData();
  }

  Future<void> retrieveLostData() async {
    final LostDataResponse = await ImagePicker.platform.getLostData();
    if (LostDataResponse.isEmpty) {
      return;
    }
    if (LostDataResponse != null) {
      setState(() {
        _video.add(File(LostDataResponse.file!.path));
      });
    } else {
      print(LostDataResponse.file);
    }
  }

  Future uploadFile() async {
    int i = 1;

    for (var vid in _video) {
      setState(() {
        val = i / _video.length;
      });
     
      ref = firebase_storage.FirebaseStorage.instance
          .ref()
          .child('videos/${Path.basename(vid.path)}');
      await ref!.putFile(vid).whenComplete(() async {
       
        await ref!.getDownloadURL().then((value) {
          vidRef!.add({
            'url': value
          }); 
          i++;
        });
      });
    }
  }

  @override
  void initState() {
    super.initState();
    vidRef = FirebaseFirestore.instance.collection(
        'Videourls'); 
  }
}  

What I have tried:

I tried the same way for adding image and it is working perfectly