Well. Just did 4 miles on the treadmill. Manually added, categorized as running, added gear, and it never added the miles OR activity. Also, can't add manually in modern view. I have to switch to classic. Also, I still haven't been able to upload/sync my run from the other day and it's on the watch still. When I plug the watch in, it recognizes it and says that it synced and to click here to view data. When I click (which takes me to Garmin Express dashboard), it's not there. I have a Mac if that helps you help me.