Spent quite a while yesterday trying to make this work, but couldn't get it to.
I made a Cardio workout and a Run workout on Connect, sync'd them to my watch, and verified that both workouts show up as workout options in the Cardio and Run activities, respectively.
But when I make a multisport activity consisting of Run and Cardio, neither of the workouts show up as options in the workout menu. Garmin website says the watch will not display workouts that are not compatible with the current activity type, so I'm assuming this means that standard Run and Cardio workouts are not compatible with a Run/Cardio multisport activity.
Does this mean that it is simply not possible to load a workout in a multipsport activity? If so, why is there still a menu option to load a workout? And if not, then what do I need to do differently to make a workout that's compatible with multisport activities?