Ability to get file as valid PowerPoint template
When working with an Excel template (".xltx") or a Word template (".dotx"), it is possible to retrieve valid data for the template using the getFileAsync-method. This allows us to save the document as a template.
However, when the same thing is done for a PowerPoint template (".potx"), the retrieved file doesn't represent a valid PowerPoint template. Instead, the retrieved file only works if it is treated as a regular PowerPoint file (".pptx").
This is a very confusing inconsistency between Word, Excel and PowerPoint.
The behavior when using getFileAsync should be the same for PowerPoint as it is for Word and Excel.