Why can’t I see NAS drive letter mapping on storage configuration?
Windows treat drive letter mappings differently for services and applications. Services are those that run before any user login. Applications are those that can only run after user login. The two sets of entities access an entirely different drive letter mapping, and as far as we know there is no way for the two sets to interchange drive letter configurations.
I'm sorry we can't offer more help regarding NAS setup because NAS is not officially supported by our software. Perhaps you can dig up related information over the Internet regarding the topic "How to mount NAS for Windows services" or Google it. Or one might want to consult NAS vendor for more information.
We recommend you use iSCSI or DAS, which does not have similar issues.