Synology DS112J used in examples.
NAS volume must not exceed 8TB
Do not share one NAS volume with multiple devices, it will lead to connection/abnormal storage
Adding DS112j via NFS Mount Type
Log into the web page of the DS112j. The IP address of DS112j.
Click Control Panel, and in the pop-up message box, click File Services. Under Win/Mac/NFS tab, enable the
NFS by tick the box in front of Enable NFS and click Apply to save the settings.
Create a Shared Folder: Then click Shared Folder and create a shared folder. In this case, we named it
“TestNas” and click OK.
Then go to NFS Permissions tab and click Create button. In pop-up message box, enter the IP address. In this
case, my IP address is 10.102.103.x, so I entered 10.102.103.0/24 (Note: /24 means that the subnet mask is
255.255.255.0). And then all the IP cameras in this segment can be mounted on this directory. Please also
select No mapping for Squash option. Click OK to save the settings.
Under NFS permission tab, you will see the mount path (file path) is /volume1/TestNas
Add NAS to the Recorder
Go to Storage > Storage Management > Net HDD and input the correct Server Address and File Path for your NAS storage folder.
The Server Address should be just an IP address, such as 192.168.1.250
The File Path needs to begin with a /, and is CASE SENSITIVE.

Once the NAS address and path have been added, you need to go to Storage > Storage Management > HDD Management. If the NAS has been configured properly, the drive should show as Uninitialized. Check the drive and choose Format to change to a status of Normal.
Once the NAS is in Normal status, you can assign recording to that drive just like a hard drive.