That isn't how Tailscale specifically works. Tailscale is designed as a point-to-point overlay network VPN. To access shares on Unraid via Tailscale, you have to use the IP address Unraid has on the Tailscale network.
There's a couple ways to find that IP: first is in the Tailscale settings page on Unraid, it'll show you the IP address there, like this:
Or, in a console on any other machine connected to the tailnet, you can ask Tailscale what IPs it knows about with `tailscale status`:
Then on the machine you want to connect to the share from (e.g., laptop), you'd point it at the tailscale address of (in my case) fd7a:115c:a1e0::8
You may have ipv4 addresses--Tailscale uses both ipv6 and ipv4 interchangeably.