Aspose Total - Aspose.Slides only converts first page

We just upgraded our Aspose Total license yesterday (August 20, 2020) and are now using Aspose.Total 20.7.2 in our .Net C# x64 Console app.

I am trying to export ALL of the slides from a PowerPoint file like this:
var pdfMs = new MemoryStream();
var msStream = new MemoryStream(byteArraySourceOfFile);
using (Presentation presentation = new Presentation(msStream))
{
// Saving the presentation to TIFF notes
presentation.Save(pdfMs, Aspose.Slides.Export.SaveFormat.Tiff);
pdfMs.Seek(0, System.IO.SeekOrigin.Begin);
var returnFile = pdfMs.ToArray();
return returnFile;
}

But it only exports 1 page and nothing more.

Why?

@CameronDyck

Can you please share the source file and generated output reproducing the issue.