I’m using zwift on multiple locations / devices and also often modify my workouts - would be nice if I can upload a new workout on zwift_com and it automatically syncs up with any new device I log into.
They do already!
Eg, I use up to 4 devices around the house including my zwift pc. I write my workouts on whichever device I’m on, throw the zwo file(s) into the right folder on the device I’m on (they all have a copy of Zwift app) and when I am next on my Zwift PC/bike, they are there.