Please keep in mind that audio will be added on a per-slide basis. Therefore, you record to each slide separately (and can revisit slides to re-record without altering the entire presentation's recording), and you will upload .mp3 files to each corresponding slide, not the presentation as a whole.

Notes:

• The maximum amount of audio that can be recorded is 20 minutes per slide.
• If you were to upload audio, you can exceed the 20 min/slide limit as long as the uploaded audio file size does not exceed 500 MB.

How to Add Audio

• Navigate into the presentation you would like to add audio to under the My Content section.
• Once in Edit Mode, select the slide you would like to add audio to. 
• Click the Slide Audio button near the bottom right of your slide preview. 
  
• You can record new audio using the Recording studio, or upload existing audio using 'Upload slide audio'. 
• When ready, click the red Recording button to start. There will be a 3 second countdown and you will need to record for at least 3 seconds to be able to save.
  
• Once complete, you will be able to Preview, Save or Discard the recording.
  
• Once complete, click the close button on the top.
• A microphone icon will indicate the slide has a narration recorded.