Hi, NYCBirdy. Thank you for reaching out. To further address your concern, we need to gather more details. May we verify where you are playing the video? Is it an edited one? We'd appreciate it if you share a sample video with us. Kindly keep us updated. Thank you, and have a nice day.
I don't recall which remotes, but it is possible to connect a microphone (to at least some remotes). That will allow you to record sounds from the operator location. I don't do it myself so can only guess at details... I would suspect that the audio track is recorded on the remote controller copy of the video. That's not the high res video that the drone itself captures, but it would be possible to extract and overlay the audio track to the high-res video.