where is memory leak?

test.cs

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using ImageProcessor;
using PdfSharp;
using PdfSharp.Drawing;
using PdfSharp.Pdf;

namespace Api.Infrastructure.Helpers
{
    public static class Converting
    {
        public static void ImageToPdf(Stream stream, string path)
        {
            using (var image = Image.FromStream(stream))
            {
                var frameDimensions = new FrameDimension(image.FrameDimensionsList[0]);
                var frameCount = image.GetFrameCount(frameDimensions);
                using (var pdf = new PdfDocument())
                {
                    for (var i = 0; i < frameCount; i++)
                    {
                        image.SelectActiveFrame(frameDimensions, i);

                        using (var inStream = new MemoryStream())
                        {
                            image.Save(inStream, ImageFormat.Jpeg);

                            using (var outStream = new MemoryStream())
                            {
                                using (var imageFactory = new ImageFactory())
                                {
                                    var factoryImage = imageFactory.Load(inStream);
                                    factoryImage.Resize(factoryImage.Image.Size.Width > factoryImage.Image.Size.Height
                                        ? new Size(792, 0)
                                        : new Size(0, 1122));
                                    factoryImage.Format(ImageFormat.Jpeg);
                                    factoryImage.Quality(30);
                                    factoryImage.Save(outStream);

                                    var page = new PdfPage
                                    {
                                        Size = PageSize.A4,
                                        Width = factoryImage.Image.Size.Width/1.3333333,
                                        Height = factoryImage.Image.Size.Height/1.3333333
                                    };
                                    pdf.AddPage(page);

                                    using (var xgr = XGraphics.FromPdfPage(pdf.Pages[i]))
                                    {
                                        xgr.DrawRectangle(new SolidBrush(Color.Black), 0, 0, 595, 842);

                                        using (var xImg = XImage.FromGdiPlusImage(new Bitmap(outStream)))
                                        {
                                            xgr.DrawImage(xImg, 0, 0);
                                        }
                                    }
                                }
                            }
                        }
                    }
                    pdf.Save(path);
                    pdf.Close();
                }
            }
            GC.Collect();
        }
    }
}