AVAssetExportSession fails due to "The operation could not be completed" when uploading to https url

I am trying to upload a video file after compressing it to our AWS server.

When uploading without compressing, it works fine.

func uploadVideoToUrlWithoutEncoding(videoUrl: URL, uploadUrl: URL) async -> Bool {
  var videoData = Data()
  do {
    videoData = try Data(contentsOf: videoUrl)
  } catch {
    print("Failed to get video data")
    return false
  }
   
  var request = URLRequest(url: uploadUrl)
  request.setValue("blobs/mov", forHTTPHeaderField: "Content-Type") 
  request.httpMethod = "PUT"
   
  do {
    let (data, response) = try await URLSession.shared.upload(for: request, from: videoData)
    return true
  } catch {
    print("URL upload failed")
    return false
  }
}

Now I am trying to do the same but with compression using AVAssetExportSession. It always fails :(

The code I used is the following:

func uploadVideoToUrl(videoUrl: URL, uploadUrl: URL) async {
  let anAsset = AVAsset(url: videoUrl)
  let preset = AVAssetExportPresetLowQuality
  let outFileType = AVFileType.mov
   
  AVAssetExportSession.determineCompatibility(ofExportPreset: preset, with: anAsset, outputFileType: outFileType) { isCompatible in
    guard isCompatible else {
      return
    }
     
    guard let exportSession = AVAssetExportSession(asset: anAsset, presetName: preset) else {
      return
    }
     
    exportSession.outputFileType = outFileType
    // Testing path/output url
    let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0] as URL
    let filePath = documentsDirectory.appendingPathComponent("rendered-Video.mov") // try this for testing
    exportSession.outputURL = uploadUrl // if I set to filePath this works

    exportSession.exportAsynchronously {
      switch exportSession.status {
      case .failed:
        let errorString: String = exportSession.error?.localizedDescription ?? "Unknown Error"
        print("Failed to upload video due to..." + errorString)
        print(exportSession.error!)
      case .cancelled:
        print("Upload video cancelled...")
      case .completed:
        print("Upload video complete!")
      default:
        print("Upload video unload error encountered")
        break
      }
    }
  }
}

This always errors out giving the error: Failed to upload video due to...The operation could not be completed Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo={NSLocalizedFailureReason=An unknown error occurred (-12105), NSLocalizedDescription=The operation could not be completed, NSUnderlyingError=0x6000019dd5f0 {Error Domain=NSOSStatusErrorDomain Code=-12105 "(null)"}}

Does anyone know why this is happening?

I also tried changing the outputUrl to be local file path just to check. Setting to local path works. So it must be something about the http url I set.

The actual url I use is something like: https://ouraddress.amazonaws.com/location/fileName.mov?X-Amz-Security-Token=tokenvalue

My current guess is that it has to do something with the security of the url?

Any help is greatly appreciated!