This hardly seems worth mentioning because it's not a problem to work around but it appears that across all three apps you can't duplicate a Global Colour and rename it using the next sequential number, (which is fine as you most likely would want to rename it more descriptively anyway), so for example if you have a single Global Colour, named Global Colour 1 by default, duplicating it won't allow you to rename it Global Colour 2 and likewise if you have two existing Global Colours named by default and you duplicate one of them, you can't rename it Global Colour 3 and so on.
However, adding additional Global Colours by clicking on the 'Add current colour to palette as a Global Colour' icon will automatically rename them using the next sequential number, e.g. Global Colour 2 and so on. Like I say, not really a problem but I just thought I may as well point it out...
Global Colour.mp4