Hi, at the start of thsi course you talked about the new alternate way of linking, without using a proxy, I did it that way, but now I'm coming up with some issues, i fixed a few. But this one i can't figure out, i get this error saying i cant edit the IK value. Thank you.
Ah, it looks like there's a new option in 2.9 to set custom properties as explicitly overridable and it's off by default.'
In the original file, turn this on in pose mode in the hand's bone properties:
Edit: I've updated the source files to include a 2.91 version of the model that includes this change.