When I have an ongoing activity recorded (even though it is paused) I can't send any tracks from my Garmin Connect Android app to Edge Explore device. The app says the track will be uploaded upon next synch, but it looks like the sync does not happen until the recording is active.
That is really weak, there is barely any interaction between Edge and GC app until I stop recording. That undortunately looks to be a cheap workaround.