I've had a ride today.
Saved the activity.
I have auto upload feature (both in GC app and 830 itself) off.
Latest GC app on my Android phone and 9.4 FW on 830.
830 went to sleep. Later I have turned it on (woke up from sleep) and I keep on trying to upload the ride, a number of times, but I keep on getting "upload failed".
Restarted the phone, turned off 830 and turned back on. Not helped.
830 syncs with the phone OK.
Turned off WiFi option on 830, still nothing. Turned off an don BT on the phone, nothing.
What next??
Never had problems with uploading activities with Wahoo ... but Garmin ?? Right from the beginning.