How to Re-Attach a VDI to a VM Template

[kagbasi-ngc]

Good-day Folks,

I have a VM Template that seems to have mysteriously detached its VDI. Does anyone know of how I can reattach the VDI.

Coming from VMware, I thought there'd be a similar functionality to convert the template back to a VM, make the fix, then convert it back.

Any assistance is greatly appreciated.