in Sharing/Views/CloudSharingView.swift [24:30]
func makeUIViewController(context: Context) -> some UIViewController {
let sharingController = UICloudSharingController(share: share, container: container)
sharingController.availablePermissions = [.allowReadWrite, .allowPrivate]
sharingController.delegate = context.coordinator
sharingController.modalPresentationStyle = .formSheet
return sharingController
}