I've had no problem in the past with VIRB Edit importing G-Metrix data directly off my previous Forerunners (310XT, 910XT, 920XT and a second 920XT), but it doesn't see my Fenix 6X even though it's connected to the computer and charging. Garmin Express has no trouble syncing with the Fenix 6X. I have to go into Garmin Connect and download the fit file and manually upload it to VIRB Edit. Very annoying.
Fenix 6X Software Version 10.10
VIRB Edit 5.4.3 (180910.1309)