如何使用Novacode Docx替换word文档中的图像

Question

我想使用Novacode Docx替换word文档中的图像，但我只知道通过此代码插入

var gDoc = DocX.Load(@"MauPhieuNhapCBCC.docx");
using (MemoryStream ms = new MemoryStream())
        {
            System.Drawing.Image myImg = System.Drawing.Image.FromFile(@"img.jpg");

            myImg.Save(ms, myImg.RawFormat);  // Save your picture in a memory stream.
            ms.Seek(0, SeekOrigin.Begin);

            Image img = gDoc.AddImage(ms); // Create image.
            Picture pic1 = img.CreatePicture(); 
            // Create picture.
            var abc = gDoc.Paragraphs.FirstOrDefault(g => g.Pictures.Count > 0);
            abc.Alignment = Alignment.right;
            abc.InsertPicture(pic1,29).Position(0.3); // Insert picture into paragraph.
        }
        gDoc.SaveAs("Exported.docx");

我怎样才能更换或插入特殊位置？