You can add page numbers to your PowerPoint slideshow through the "Slide Master" page, which lets you edit your entire slideshow at once.
You can insert a PDF into a PowerPoint either as an object, and then set it so it opens when you click it.
When you present a slideshow, it’s likely that you have more to say than what displays on the slides. You may want to expand on the text you’ve included, or if the slide only contains visuals, explain ...
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