Add Audio To Your Powerpoint. Click on the Insert tab on the menu bar. PowerPoint opens a window called Insert Audio Use it to navigate to the folder in which your audio file is stored on your device select it and then click or tap on the Insert button.

This method will not allow you to save your PowerPoint as a video since it does not synchronize timings to automatically move the slides with the audio. Click the Insert tab on the menu bar and click the Audio File button in the far right corner of the menu bar. You can insert external audio files into a PowerPoint presentation.
Also you need to know that using audio files is best for listeners because they like to hear things more than reading or watching.
Open the PowerPoint Presentation Open the PowerPoint presentation and click on Insert Audio. Open your presentation and select the slide where youd like the track to begin playing. You can adjust the slide timing and the amount of time theyre visible to ensure they make sense of whats being said in your audio. Click on Audio and then select Audio on My.