Remapping device buttons - ASUS ROG Xbox Ally

Hi all. I’m having difficulty remapping the buttons on my ASUS ROG Xbox Ally. The Xbox button is mapped to open HHD which is fine, but when going into the Shortcuts section and setting e.g. the Armoury Crate button to open the Steam Keyboard, it doesn’t do anything. IIRC the buttons on this handheld are:

  • Command Centre / Armoury Crate (top left)
  • View (bottom left)
  • Library (top right)
  • Menu (bottom right)

Also, when I hold the Library button, the device vibrates but doesn’t seem to do anything. Is this a function that I’m missing?

Thanks.