How can I access an image shared from Files or Photos in a .NET iOS (formerly Xamarin.iOS) app?

Question

I'm working with a .NET iOS (formerly Xamarin.iOS) app and I want to access an image shared from the Files or Photos app. I’ve tried implementing a Share Extension without a UI, but it’s not working as expected. Additionally, the debugger is not functioning properly in the .NET iOS extension project.

Is there a correct way to achieve this in .NET iOS, either with or without a share extension?

What I have tried already :

• Created a share extension project via XCode.
• It creates all required folder / files in our project.
• Converted Principle class to UIViewcontroller instead of SLCompose.
• Did override required method to load image using NSContext.
• Create new profiles and app group.

void LoadImage (NSExtensionContext extensionContext = null) {

        var image = new NSExtensionItem [0];

        NSExtensionItem inputItem;

        if (extensionContext == null) {

            inputItem = ExtensionContext.InputItems [0];

        }

        else {

            inputItem = extensionContext.InputItems [0];

        }

        var outputItem = inputItem.Copy () as NSExtensionItem;

        var itemProvider = outputItem.Attachments [0];

        string imageTypeIdentifier = "public.image";

        string pdfTypeIdentifier = "com.adobe.pdf";

        var test = itemProvider.GetRegisteredTypeIdentifiers (NSItemProviderFileOptions.OpenInPlace);

        if (!(itemProvider.HasItemConformingTo (imageTypeIdentifier)) || itemProvider.HasItemConformingTo (pdfTypeIdentifier)) {

            OpenUrl (NSUrl.FromString ($"myapp://itemtypeimagedoesnotexists)"));

            return;

        }

        itemProvider.LoadItem (imageTypeIdentifier, null, (item, loadError) => {

            if (item != null && loadError == null) {

                InvokeOnMainThread (() => {

                    OpenUrl (NSUrl.FromString ($"myapp://{item.ToString ()}"));

                    if (item is UIImage) {

                        SaveImageToAppGroup (item as UIImage, "shared_image_url.txt");

                    }

                });

            }

            else {

                InvokeOnMainThread (() => {

                    OpenUrl (NSUrl.FromString ($"myapp://itemisnullorhasloaderror"));

                });

            }

        });

        itemProvider.LoadItem (pdfTypeIdentifier, null, (item, loadError) => {

            if (item != null && loadError == null) {

                InvokeOnMainThread (() => {

                    OpenUrl (NSUrl.FromString ($"myapp://{item.ToString ()}"));

                    if (item is NSData) {

                        SavePdfToAppGroup (item as NSData, "shared_image_pdf.txt");

                    }

                });

            }

            else {

                InvokeOnMainThread (() => {

                    OpenUrl (NSUrl.FromString ($"myapp://itemisnullorhasloaderror"));

                });

            }

        });

    }

    public void SaveImageToAppGroup (UIImage image, string fileName) {

        var appGroupPath = NSFileManager.DefaultManager.GetContainerUrl (APP_GROUP_IDENTIFIER);

        var directoryPath = appGroupPath.Path;

        if (!NSFileManager.DefaultManager.FileExists (directoryPath)) {

            NSError createDirError = null;

            NSFileManager.DefaultManager.CreateDirectory (appGroupPath, true, null, out createDirError);

        }

        NSData imgData = image.AsJPEG ();

        var filePath = Path.Combine (directoryPath, fileName);

        NSError saveError = null;

        imgData.Save (filePath, NSDataWritingOptions.Atomic, out saveError);

    }

Here, file is not saved in app group using extension. So, I can not read it in the app as well.

Any leads ?