Increase disk space - Nextcloud v19.0.0 Snap Install

I am trying to increase the disk space available to my nextcloud install, originally set up with Snap (during linux install)

I set it up with 200gb, but now I need to give it more.
The install is a virtual machine, so allocating disk space is easy and we already have allocated it more disk space on the VM however the server is not seeing that, how do we go about getting the server to see the additional allocated space?

But, linux/nextcloud won’t automatically allocate this new space.

So does anyone know what I need to type to increase the space?

unfortunately, I am not a Linux expert :frowning:

Hopefully this makes sense.