Alternatively, you could also try to add an external HDD to your NUC, configure that as a storage and move the VMs disk there as a workaround.
Once you have a new storage configured and the content field set to hold VM images you can do it by selecting the disk and then click the Move Disk button.Not sure how to "move" the VM disk to the new disk
Once you have a new storage configured and the content field set to hold VM images you can do it by selecting the disk and then click the Move Disk button.