Using Garmin connect sometimes it is can't download from smartphone to my GPS a track.
this issue is not always present because sometimes the track is uploaded.
my smartphone is syncronized with Edge810 and always It is possible to download from GPS to smartphone the new tracks.
the same story when it is used a notebook that has Garmin Express.
By the Italian customer care I made a hard format, but anything is changed.
in attached a gpx track that I can't download.