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File Size Limitation of Manual Uploads to Garmin Connect
When manually uploading a file containing multiple activities, or a very long individual activity, you may receive an error message preventing the file from uploading successfully.
The Garmin Connect™ platform has a file size limit of 25 megabytes (MB) per file. There is also a limit of 99,999 total points per file.
NOTE: The 99,999 point limit will prevent activities that are longer than 27 hours in length when using the one second recording option on devices.