On my Garmin Forerunner watch, under Settings/System/USB Mode - change to "Mass Storage" from "Garmin".

I connect the watch via USB cable and copy the FIT files over to the computer.

Looks like there's the same setting in a similar location on the Epix watch - https://www8.garmin.com/manuals/webhelp/GUID-E5C62F3F-DCE3-4...