Yes I looked over that. Looks like you can still assign 730G to your root volume since that is where your shared network drive is mounted from looking at your windows file explorer screenshot. You can do the following.sda2 is the boot partition.
[email protected]:~$ sudo pvs
PV VG Fmt Attr PSize PFree
/dev/sda3 ubuntu-vg lvm2 a-- <930.01g <730.01g
[email protected]:~$ sudo vgs
VG #PV #LV #SN Attr VSize VFree
ubuntu-vg 1 1 0 wz--n- <930.01g <730.01g
I was thinking maybe I could use a live usb and try to add a partition with gparted.
lvextend -L +730G /dev/ubuntu-vg/ubuntu-lv -r