Just stopped and uploaded a ride (actioned via the Android App) and the stats on Strava are a portion pf that showing in the Zwift Dashboard.
and
Hi Craig,
Sorry to hear you’re having some trouble with missing data! Could you open up a support ticket and include the log.txt file from that ride (in Documents > Zwift > Logs), as well as the fit file from the Activities folder *and* the fit file as downloaded from your dashboard so we can compare?
Thanks!
Having no luck with the logging of rides now 
No download link on the ride, 0 byte FIT file on the computer.