I used to have my website running on a physical Windows Server 2016 machine with IIS 10 which accessed its data files on an old Netgear NAS. I have since replaced the NAS with a Synology RS815+ running DSM 6.2.4-25556 Update 6 and virtualized the web server, with the intention of also running the website off of a NAS share. Just as what automatically happens with inetpub\wwwroot, I need to enable read permissions on the website folder as well as the data files to be served for IIS_IUSRS. The Synology is joined to my domain.
When I access any specific NAS folder's Properties/Security, click Edit and Add, enter "IIS" and click Check Names, I get the Name Not Found box. I've checked everything I can think of. Is there a DSM setting I'm missing? Or is this truly a Windows issue? Currently, the website is up on C:, but that's not ideal on my VM, and it can't access its data files to be useful. Can anybody help get my site up again?