[webp]animated webp image became static after processing #2521

           using (var imgStream = new MemoryStream())
           {
               await Request.Body.CopyToAsync(imgStream);
               if (imgStream == null || imgStream.Length == 0)
               {
                   return Fail("image can not be null");
               }
              var  buffer = new byte[imgStream.Length];
               imgStream.Position = 0;
               await imgStream.ReadAsync(buffer, 0, buffer.Length);
               //using(Image img=Image.Load(file))  //At first i wrote this line which turned out img.Frames.Count=1
               using (Image img = Image.Load(new DecoderOptions { MaxFrames = 100 }, file))//this way turned out img.Frames.Count=12
               {
                           var filePath= AppContext.BaseDirectory + Guid.NewGuid().ToString() + ".webp";
                           await img.SaveAsync(filePath);
               }
           }