A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
Inserting a file as an object uses Windows OLE technology. MacOS does not use OLE. There is a miniport of the technology that Microsoft includes in Office for Mac, but it only supports inserting Word or Excel files in Word, Excel or PowerPoint.
Instead, you can insert each page of a PDF as a picture on a PowerPoint slide. Or put the PDF in the same folder as the presentation, link to it from the deck and send both files to the recipient(s).