If upon attempting to upload a GPS file you see an error message telling you that your file is "Not an activity," this means that your file is incompatible with Strava.
The problem is that your file is likely saved as a "Course" instead of an "Activity" file. These files most often come from Garmin devices - the Course files are used for navigation and Virtual Partner™ purposes and can be saved in either .TCX or .FIT format. Since these files do not necessarily reflect the recording of real-world activity, they will be rejected upon upload.
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