I have NVR4216-16P-4KS2 and have been trying to get the ANR function to work. From what I have read you just enable it and set a time and it's suppose to do the rest.
I have IPC-HDBW4631R-ZS and IPC-HFW4631H-ZSA cameras with 64GB cards installed in the cameras. Logging into the camera shows...