IVMS-4200 Audio Works Live But Not On Playback

I have a hikvision oem NVR with some hikvision cameras. I enabled audio in the image settings, and if I toggle the audio on in IVMS-4200 while watching the live video I hear the sound. But by playback, there is no audio. Am I missing something else I need to toggle?

My google skills are not helping that much.

Thank you

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