Display AR QuickLook preview of usdz model not in main bundle

Hi all, this is my first time trying to add an AR preview into an app (also my first time using the file system). I have been trying to implement a solution similar to that explained here https://developer.apple.com/forums/thread/126377 however one key difference is that my usdz model is not in my main bundle as it is generated and downloaded from an external source at run time. I was wondering if it is possible to display a file stored in the apps documents or cache directory and how it is done.

The file is downloaded and stored in the caches directory as follows:

class ModelFetcher: NSObject{
  var modelUrl: URL?
   
  func generateModel() {
    guard let url = URL(string: "http://127.0.0.1:5000/model.usdz") else {return}
    let urlSession = URLSession(configuration: .default, delegate: self, delegateQueue: OperationQueue())
    var request = URLRequest(url: url)
    request.httpMethod = "POST"
    let downloadTask = urlSession.downloadTask(with: request)
    downloadTask.resume()
  }
}

extension ModelFetcher: URLSessionDownloadDelegate {
  func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
    print("File Downloaded Location- ", location)
     
    guard let url = downloadTask.originalRequest?.url else {
      return
    }
    let docsPath = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask)[0]
    let destinationPath = docsPath.appendingPathComponent(url.lastPathComponent)
     
    try? FileManager.default.removeItem(at: destinationPath)
     
    do {
      try FileManager.default.copyItem(at: location, to: destinationPath)
      self.modelUrl = destinationPath
      print("File moved to: \(modelUrl?.absoluteURL)")
    } catch let error {
      print("Copy Error: \(error.localizedDescription)")
    }
  }
}

and then the quick look preview looks like this:

import SwiftUI
import QuickLook
import ARKit

struct ARQuickLookView: UIViewControllerRepresentable {
  var allowScaling: Bool = true
   
  func makeCoordinator() -> ARQuickLookView.Coordinator {
    Coordinator(self)
  }
   
  func makeUIViewController(context: Context) -> QLPreviewController {
    let controller = QLPreviewController()
    controller.dataSource = context.coordinator
    return controller
  }
   
  func updateUIViewController(_ controller: QLPreviewController,
                context: Context) {
    // nothing to do here
  }
   
  class Coordinator: NSObject, QLPreviewControllerDataSource {
    let parent: ARQuickLookView
    let destinationPath = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask)[0].appendingPathComponent("model.usdz")
    private lazy var fileURL: URL = destinationPath
     
    init(_ parent: ARQuickLookView) {
      self.parent = parent
      super.init()
    }
     
    func numberOfPreviewItems(in controller: QLPreviewController) -> Int {
      return 1
    }
    func previewController(
      _ controller: QLPreviewController,
      previewItemAt index: Int
    ) -> QLPreviewItem {
      let fileURL = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask)[0].appendingPathComponent("model.usdz")
      print(fileURL)
      let item = ARQuickLookPreviewItem(fileAt: fileURL)
      print(item)
      item.allowsContentScaling = parent.allowScaling
      return item
    }
  }
}

struct ARQuickLookView_Previews: PreviewProvider {
  static var previews: some View {
    ARQuickLookView()
  }
}

However, I get an error reading "Unhandled item type 13: contentType is: (null) #PreviewItem"

I know the file is actually located at this location as I have opened it in Finder. Any help would be much appreciated.

Thanks in advance, Louis