You don't "mount" the virtual disks in Proxmox (like seems you were trying to do in your first post). You have to have the virtual disk available in proxmox (different storage technology so different ways to have that) and "link" it to the vm in the vmid.conf file, so QEMU/KVM sees them as block device and, INSIDE the VM (= by the OS of the VM) mount them and use them.
The config file you showed in the picture has no reference to the "virtual" disks that the VM should use, you don't tell us in what storage it was, and when you state "A partition was removed from a VM" in your first post is very different from what you really mean, AFAIU... maybe you meant that a virtual disk was deleted from the vm config? Deleted from proxmox itself (i.e. the .qcow2 file)? How (if just in the config, through GUI it was listed in "unused" section of the config itself, easy to re-link)?
