As thefunnyman pointed out, TrueNAS will make for a more user friendly sharing experience, but you could also just load a container up with Samba on Proxmox, to give you the NAS feature you seek. The heavy lifting of software RAID/ZFS would then be handled by Proxmox.

IMO NAS setup is much more straightforward on truenas. It’s doable in Proxmox inside a VM or LXC, but true as exposes this all directly via a nice UI. I personally use Proxmox with a simple Debian NFS VM, but for less technical users that just want stuff to work I tend to recommend they stick with truenas.