Flutter - Upload Image with ImagePicker Web and Firebase Storate

upload_image.dart

import 'dart:html' as html;
import 'package:uuid/uuid.dart';
import 'package:image_picker_web/image_picker_web.dart';

Future uploadImage() async {
    var image = await ImagePicker().pickImage(source: ImageSource.gallery);

    if (image != null) {

      final metadata = SettableMetadata(
        contentType: 'image/png',
      );

      var uploadTask = FirebaseStorage.instance
          .ref("/noticias/$uuid/thumbnail-$uuid.png")
          .putData(await image.readAsBytes(), metadata)
          .snapshotEvents;

      uploadTask.listen((event) async {
        if (event.state == TaskState.success) {
          String fotoURL = await event.ref.getDownloadURL();
          setState(() {
            thumbnailUrl = fotoURL;
          });
        }
      });
    }
  }