I'm currently using iVMS-4200 with a DS-2CD2185FWD and a DS-NVR-V120B2018030. I record all video 15 sec before motion and 30 sec after motion. But when I use Event center and play video there, I only get 5 seconds. I have tried to change maintenance and management -> Live view and playback -> Preplay for 30 seconds but nothing is happening. I have tried searching alot, but can't find any solution. Anyone got some tips for me? The best would be that I could preview my clip from where I got motion to the motion stop. And then I could go to remote playback If I need more.