Sorry, we don’t support zone workouts. Since the don’t make sense for indoor erg workouts, which is mostly what we support we never added them. We fake it a bit in our editor which is just convert them to the middle of the range power of coggan zones. We can add this as a feature request to do this conversion if we see zone segments, we would use coggan zones since we don’t support custom zones or know what the intervals zones are. It’s not super hard to do this in the most basic way but the only problem is I have only had someone ask for this one time that I know of until now.