Google Slides allows you to add audio files to your presentations for a narrated presentation.
- Create an audio file in a free audio recording tool (such as audacity).
- Upload the file into Google Drive.
- Insert the audio file into your presentation by navigating to the slide you want to add audio to, click the "Insert" tab, and click "Audio".
- Select the correct audio file from the popup.
- A speaker icon will appear on your slide where your audio is located.
Another option to record narrated presentations is to view your presentation in Zoom or Panopto and record while narrating your presentation.