Using an iOS storyboard and viewcontroller in Maui

I am in the process of porting my xamarin.ios project to maui.

Unfortuanately I have a storyboard and viewcontroller I cannot replicate in maui. (Dropbox)

Is there a way I can use that part in my maui project?

I copied the files to Platforms/iOS but not sure how to actually launch them from a button on the maui side.

It consists of a storyboard file and amd associated UIViewController

I tried this, but I get an exception "Could not find a storyboard named Dropbox in bundle NSBundle"

UIStoryboard board = UIStoryboard.FromName("Dropbox", null); << EXCEPTION HERE

UIViewController ctrl = (UIViewController)board.InstantiateViewController("CDropBoxVC"); 

// Get the current Navigation Controller
var windowScene = UIApplication.SharedApplication .ConnectedScenes
.ToArray()
.FirstOrDefault(s => s.ActivationState == UISceneActivationState.ForegroundActive) as UIWindowScene;

if (windowScene != null)
{
    var window = windowScene.Windows.FirstOrDefault();
    if (window != null)
    {
        var navigationController = window.RootViewController as UINavigationController;
        if (navigationController != null)
        {
            navigationController.PushViewController(ctrl, true);
        }
        else
        {
            window.RootViewController.PresentViewController(ctrl, true, null);
        }
    }
}