I can't upload. Not by using manual "upload" from GC, Fit or WiFi. Tells me the servers are unavailable, although I can log-in and look at previously uploaded exercises.
Update: seems to be an issue with one specific exercise file. Other test files recorded since work okay. I can get the file into Garmin Training Centre without issue, but not up to Garmin Connect. Tried exporting file from GTC, but no change. Guess I have a corrupt file - though it's strange that it looks just fine in GTC and only GC has an issue with it.