Edit TCX file for elevation

Hello,

Long story short I needed to edit an activity in Garmin Connect but there is no way to push the edited ride to Strava. I have been trying to navigate editing the TCX file to reflect the details. I have figured out how to adjust the mileage and time, but can't figure out how to edit the elevation gain in a TCX file so that it uploads the full ride elevation on Strava. Any suggestions?