Tracking the progress of loadTransferable of a PhotosPickerItem

Question

I am loading a video from the user's photo library. I want to track the progress of loadTransferable to update a progress view. However, I am having a ton of trouble observing the key values.

I have tried creating an observable object as well, but I can never get the code in the observe closure to run.

Does anyone have any ideas? Thanks in advance :)

import SwiftUI
import Photos
import PhotosUI

struct ContentView: View {
    @State private var selectedVideo: PhotosPickerItem?
    @State private var observation: NSKeyValueObservation?
     
    private func processSelectedVideo() {
        let progress = selectedVideo!.loadTransferable(type: Data.self) { result in
            Task {
                // do something
            }
        }
        observation = progress.observe(\.fractionCompleted, changeHandler: { progress, value in
            // this never runs
            print(value)
        })
        progress.resume()
    }
}