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Invalid FIT File

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