Hi,
I've got an issue since beginning of October: I discover that Garmin Express is deleting my .FIT just after his synchronization by USB cable (in the C:\ProgramData\Garmin\CoreService\Devices\xxxxxxxxx\Sync\FIT_TYPE_4 directory).
I saw it appearing at the begining of the Garmin Express synchro, then it was deleted at the end.
I un-installed and re-installed Garmin Express but the issue is still there.
For information, the autosync by wifi of my Fenix 3 is disable.
Thks for your help.