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Need help with fixing corrupt fit file

Did big triathlon race this weekend and can't upload activity to Garmin Connect. Here's what I have tried so far:

- can see all the activities on watch (FR955)

- can download .fit file

- Garmin Connect mobile app synchronized with watch with no errors but activity never uploaded

- Garmin Express synchronized with watch with no errors, activity never uploaded

- trying to upload the file to Garmin Connect web shows "An error occurred with your upload. Please try again."

- I tried fixing/adjusting time with www.fitfiletools.com - can't upload fixed files either with the same error.

- Was able to upload the file to Strava no issues, it created 5 activities (swim, T1, bike, T2, run). Trying to upload those individual activities to Garmin Connect web - same "An error occurred with your upload. Please try again."

Anything else I can try?

[solved]