@Andressalgado81 I too have the same problem. The videos are being stored but sadly with no audio via the app. The audio on the camera does work but only when it's being viewed live. If I download the video onto my phone the audio does work though not during the app. Weird and a bit of a pain. I've selected 'record video and audio' but still no luck via the app. I have even gone to measures of uninstalling the camera and app. Annoying really as now it's more like a webcam than a camera. Tempted to cancel the monthly subscription and change over the Ring. I have a few of their cameras and they've never let me down (and store audio). Let me know if you have any luck.  

@Andressalgado81 Same problem here too, except with a KC200 camera. Running app on a iPhone X iOS 14.0.1. The videos are being stored but no audio via the app or when clips are downloaded. The audio on the camera works when it's being viewed live. Has worked fine previously, not sure exactly when it stopped recording audio. Like others, I've tried selecting 'record video and audio' via the app. Suspect the problem may have started after a software update? 

@Jmw I've had the same problem since I updated the Kasa App on my phone a couple of days ago.  I've been in touch with Tp-link via facebook messenger & they are looking into it. 

@Solla-topee Thanks for the reply. Yes, Kasa APP version 2.26. We await the engineers solution!

I too have the same issue with my KC100 cameras which stopped play back of audio on my recordings a day ago.  I can hear audio when going LIVE. There is a software glitch somewhere.  Hope TP Link can fix the issue soon as I monitor my 91 year old Dad.  For some of us this can be a real safety issue!  Please get the software bugs worked out ASAP please!!!

@Solla-topee Same issue for my camera video clips. V2.26. No sound on stored clips even though I hear sound on live feed. 
 

iPhone volume is up and not muted. 

@Andressalgado81 same issues here. I hope they resolve this quickly!