Export as image issues.

I need to process many PDFs and export it as an image, the first PDF works fine, however and other PDF I load and export, the image is always of the first one. I do not get any errors. This is the code I'm using:

            SfPdfViewer pdfViewerControl = new SfPdfViewer();
      
            Stream stream2 = pdfViewerControl.ExportAsImage(0,2.0f);

            stream2.Position = 0;

            byte[] imageAsBytes = Converters.ToByteArray(stream2);

            PDFImage.Source = ImageSource.FromStream(() => new MemoryStream(imageAsBytes));

            filePath = Path.Combine(localFolder, "test.png");

            File.WriteAllBytes(filePath, imageAsBytes);

Again this works fine on the first PDF, but on any other PDF all I get is an image of the first PDF.

If I add this line:

     pdfViewerControl.Unload();

I get this error:

"Object reference not set to an instance of an object."

I also tried, instead of creating the PDFViewer in code, creating it in XAML, the UnLoad works, however in this scenario, the image doesn't get exported, it just creates a 0 byte file.