Hi localstarlight,
You need to use “Set Keyboard Focus” after “Add to Viewport”
Then go to your Widget Blueprint and override the function “On Key Down” or “On Key Up”, whatever you want.
By last, in the new function you can detect any key you want.
I really don’t know all the differences about return Handled or Unhandled, but I know that Handled block another Inputs that are in another blueprint, Unhandled not.