Shared folders - single drive

I have a HP Mini with a single SSD. I let OMV 5 take the whole drive during install. Now I want to create a shared folder, but can't, no drop downs.

My filesystem is:

/dev/sda2 ext4 (majority of drive)

/dev/sda1 vfat

/dev/sda3 swap

Do I need to make another filesystem to create shared folders? I didn't do this in OMV 6 on a Odroid.

My goal is to install Docker.

Just did that - fixed

Thanks!