Is Opero Documents able to support presentations (e.g. Powerpoint)?

Our app only functions with Google Docs and not with Google Slides at this time or Powerpoint. We recommend to create new Google Doc as a template and change page orientation to landscape (go to File > Page Setup > Select “Landscape” > Click Ok). And if needed, you can also change page size. Then using our app you can produce PDF which would look like presentation file. See this use case article for more detail.