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Play music across multiple slides in your slide show
You can add a song to a presentation and play it across slides in the background of your slide show. If you want to use music from the web, you have to download it to your computer before you can use it in a presentation. On the Insert tab, select Audio, and then Audio on My PC.
Add or delete audio in your PowerPoint presentation - Microsoft …
To add music or other audio clip to your slide show, select the slide you want and click . You can add audio to a single slide, play audio automatically when a slide appears, or add a song that plays as background music during your entire presentation.
Extract files or objects from a PowerPoint file - Microsoft Support
You can extract files and objects, such as videos, photos or documents, from PowerPoint presentations for separate use. The easiest way to do this is to turn the presentation into a "zipped" file.