I plugged in an old Lorex NVR and it won’t allow me to do anything without saying to install plugins first, which doesn’t work. At least Amcrest is allowing some functionality from a web browser. With that being said it looks like it will allow me to save a MP4 clip directly from the NVR with the mouse while viewing the monitor connected to it. That’s my next suggestion, plug in a usb flash drive to the NVR and try the scissor, click on the time next to it and change the start/end time method. Of course this assumes you have a mouse and monitor connected directly to the NVR