Remote Access to a NAS through a VPN?

Hello! I own a PR4100 and being new to NAS devices, have enjoyed many of its features. I store and play some games through an ISCSI on it and find that to be quite effective. If I leave the local network, though I cannot access the games through the ISCSI. I have done some research on remote access to a NAS through a VPN and discovered a few results, none pertaining to a WD device though. Has anyone had experience with remote access to a NAS’s ISCSI in the past or does anyone have any helpful links on the subject?

Thank you so much in advance for your time!