tyring to upoad image to firebase but im getting Xfile has no instance method 'getByteData' error

Question

this is my upload function but its posting to firebase.

 List<XFile>? images = [];

 Future<Future<String>> postImages(imagefile) async {
String filename = DateTime.now().millisecondsSinceEpoch.toString();
FirebaseStorage db = FirebaseStorage.instance;
await db
    .ref()
    .child("images")
    .child(filename)
    .putData((await imagefile.getByteData()).buffer.asUint8List());
return db.ref().child("images").child(filename).getDownloadURL();

}

``