R,
By default, the workout “profile” in TP for the 80/20 cross-train options is still a run. If you were to perform a strength session, for example, it would upload the strength session as an “other” profile and leave the original cross-train run workout as incomplete. If, however, you change the workout profile in advance to a bike, strength, or other, then TP will match up the uploaded workout to that workout.
It’s really not a big deal if your strength uploads to a new workout and leaves the run incomplete. Just delete the incomplete run.
David