Elevation data

Hi all.

Is there any way to correct the elevation data on Xert? My Wahoo file only shows 2 meters of elevation while it should be 800 meters. I corrected it on Strava but Xert does not use the updated data.

Depends on whether Strava actually updates the original data.
If yes, then you could delete the activity in Xert and use Sync to import the missing activity from Strava. Or export the updated FIT file from Strava and import that into Xert.