In xpression has nothing to do with the Global store you can not load from the XPression into your global store. You would need to export it to PNG or TGA and transfer into the Switcher Hard drive so that you can load it into the Global Store.
Are you trying to run it off of the XPression from the switcher -- and then Key the XPression channel over top in say Key 4? If that is the case then you need to tell me first what form off communication your using with the XPression -- is it RossTalk or are you using VDCP? My guess would be RossTalk since your loading these as TakeIDs.
#Vision