Just a warning that if you quit the MTB course for whatever reason you will lose your entire ride. This means if you’ve just done a long ride then thought you’d finish with a test on the MTB, and had to quit because of steering issues or something, you will lose all data. Zwift will 0 everything, miles ridden, time, etc.
Is partial FIT file still there though?
It is. You can upload it to Strava, but that’s about it. Won’t count toward Zwift totals. Won’t import into Garmin.