Adding an additional ssd for storage?

Hey, I have a new mini-pc that I installed home assistant os on, and so far everything is graet.

The mini-pc comes with a port to connect an additional ssd, which I have.

How can I configure it and use it for extra storage (since I’m also using the pc as a media server)?

The os seems very limited, and I haven’t been able to find an answer online.

Thanks