The NVR must be installed a hard disk and record the video successfully before you playback it.
Go to the Live Video interface, click the button →Hard disk video, the App will automatically playback camera1, refer to the pictures below, you can switch the channels by yourself.
Tips: Videos in playback are HD main streams, which require very good transmission condition. We suggest to playback in LAN. Remote playback out of LAN may not 100 % work due to connection & network condition. Fast forward & backward buttons may not work due to big video stream. Yet you can move to a certain time point by using the time bar.