Proxmox second disk for media


I have a Synology NAS that contains all my media. However I want to use that media in my Home assistant.

Home assistant was installed via the awesome tutorial found here: Supervised Install on Proxmox - #5 by fets83

However I don’t know how to access the media on the nas. I’ve added the nas via CIFS in proxmox
then added a second disk to the Hass VM:

I see the sdb in my hardware info:

But what now? do I need to configure anything? how can homeassistant / addons access this disk?