Do you encounter that you have read the document, but still do not understand clearly with it? So you need to communicate with the presenter or author about some questions over the phone. The narration goes with the presentations take the presentation and training to modern times.
With 
2. You could select “Background Music for the whole presentation” and then click to import the background music from local disk to the presentation.

3. Select the slide which you want to import the audio clip, and then import the audio clip from local disk to the presentation.
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