I have just completed the Aberfeldy 1/2 Ironman using the 735xt. Using the Triathlon activity type, it was recording all the data as I went along, but now as I try to upload the file it is showing, "invalid" in History and continues to error when I try and sync.
Any suggestion please, as I am gutted to lose all this data
ps, the map is on the watch showing my my swim, bike & run