Narrative Reporting Check In Issues with PowerPoint

I am trying to build a demo of Narrative Reporting/Extensible Documents and am having issues with the PowerPoint document.  I was able to add a cube view to a Word document and got it to render properly.  However, when I tried to do a similar test with the same cube view to PowerPoint, I get this error when trying to check the PowerPoint file back in:  

It looks as though it wants a “document” and not a “presentation” so I feel like I’m missing something.  Thoughts?  Thanks!!