Send Presenter Audio back to the actual PowerPoint

My SME recorded audio in PowerPoint. I then saved the pptx to a zip file and pulled out the audio files. Then I imported them into Articulate Presenter 13, made a lot of changes to the PowerPoint and turned it into an eLearning module.

Now the SME wants the PowerPoint with his audio back. Is there any way to easily do this now that the audio is no longer part of the actual PowerPoint file?

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