Nextcloud on Hetzner with storage box

Hello, i need your advice and help.
I am new to Nextcloud and Hetzner so please ask me if i am not clear with my post. Thanks in advance!

I have a Nextcloud installed on a Hetzner server with 20Gb drive.
I want to get a storage box and make it my primary data drive.

First question, is that possible?
Second question, how to do it?
Third question, will it impact the speed and functionality of my instance?

Ask Hetzner. They are your provider and it is their job to help you out.

Thanks for the answer!
I asked Hetzner too but i wanted an opinion from Nextcloud since it is the platform i have decided to use, regardless of provider.