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How Do I Manually Upload an Activity I Recorded to Garmin Connect?
You may be able to manually import an activity from your device if it did not sync to your Garmin Connect™ account using the Garmin Connect™ app, the Garmin Express™ program or the Wi-Fi sync with compatible devices. Requirements to do this include:
File being uploaded as a .fit, .gpx, or .tcx file not exceeding 25 MB.