I have a run activity that does not sync from my garmin fenix 7 to garmin connect, although all other activities before and after sync very well.
I have copy the .fit file from the watch and did a manual upload to both Connect and Strava but non work.
When I inspect the .fit file and compare it to other .fit files, I regconize that the file size is much smaller and it contains much less data.
I have tried some tool to add missing manufacturer and device name to the file but did not solve the problem.
Here is the .fit file