Specify Storage for NextCloud

I’m really new to this and I setup a windows 10 with docker installed and nextcloud.
I tried to install nextcloud on docker and I couldn’t figure out how to specify storage location.
My setup has multiple HDD inside and I’m not sure if I just install Nextcloud first with everything on default and then select storage or do it beforehand.

I tried it with default but couldn’t find where to specify where I want my files to be stored.

Please help with this noob, I tried reading and youtubing about it but still couldn’t find a solution

Thank You!