When uploading and publishing a PDF(PowerPoint, Office) document to Playipp, it will convert the pages of the document to images and create a slideshow. The slideshow is one object in the playlist.
If you have multiple pages in the PDF(PowerPoint, Office) document it will add them to the total time played. This will look like a single PDF file in your playlist, and when you preview you will see all objects, and all images in the slideshow.
You are able to read more here how to publish documents: Publish PDF, Powerpoint, Office documents