Is there a chance to transfer/copy fit files from the Fenix 5x to PC (Windows) or Smartphone (Android) without using the USB cable and online sync? Maybe over a debug connection, samba or ANT (smartphone is ANT+ capable), ...?
Not sure what is your aim, if you mean just plain wireless transfer between the watch and phone/PC or whatever to do not to use the cable connection. I use sync and then in Garmin Connect via web from mobile/PC you can download fit file of an activity, would this help?