Extremely old topic, but I ran across the problem today. 2 things:
1) Great instructional video: https://www.youtube.com/watch?v=6EoRFxaF7b0&list=PLpgIQbB1MOcxznCPMbJyPyFlo9D3rTZEK&index=8
2) I…
Other than what CoryVDavis mentioned. If the manual upload does not work, the activity fit file is possibly corrupted. Zip and attach your activity fit file here. We may be able repair it for you.
This will work - mustikka-fixed.fit
Upload to Garmin Connect, then change the activity type from "Other" to "Cycling." I ran the fit file through FIT File Tools. Used the section remover without any changes.
I would sync then remove all the activity fit files on your device. This could minimize the chances of getting more corrupt files - Removing Activity Files