Maya 2020: Quick Rig + Attach Hands

The Quick Rig Tool that was introduced in Maya 2017 allows users to create a HumanIK rig for a human character with a single click. Unfortunately, the Quick Rig Tool doesn't create any bones for the fingers.
This video shows how you can manually (and quickly) add a hand skeleton (or any other skeleton parts) to your character during the Quick Rig process.


PROBLEM: after saving the character and loading it again the Control Rig seems to be broken, the handles will not move anymore.


Here' how to fix it:
When I copy the left hand over to the right side (after deleting the original right hand) the DEFINITION of the HIK character is broken.
What you need to do now is:
- in the HIK panel in the "Definition" tab turn off the "Lock" icon - this will delete the Control Rig - the regular skeleton is now visible
- select the joint of the right hand
- in the HIK panel hold the right mouse button over the GREY bone icon of the right hand and choose "Assign Seleced Bone" (the icon turns green or orange)
- turn the "Lock" icon back on
- in the HIK Panel pulldown menu "Source" choose "Control Rig" - a new Control Rig appears, should be working now
I hope this works for you.