Last week, I did a 33 mile bike ride out to Tombstone, and was quite excited about getting back and updating the data. I did everything correctly to get it to upload. My watch is set to erase the data after it has been sent up. It was sent to the ANT stick but never transferred to Garmin Connnect. When I try to manually upload the file, it will not allow me to. It gives me an internal server error. I tried contacting customer support but got no reply to the issues. Now when I try to upload new data, the data will transfer to the stick and then it will say that the data has been uploaded to Garmin Connect but when I go to Garmin Connect the data does not show up. If I go to the Upload button, it will upload the latest data but not that bike ride info. Is there a way I can re-format my ANT stick or clear the data on there that is creating this error?
You need to find the directory on your computer where the ANT agent stores the activity history, and see if there are any files there that correspond to your missing ride It may be that you have a corrupted FIT file (which can sometimes be fixed). The ANT USB stick does not contain any memory and does not store your files.
C:\Documents and Settings\(Your user name)\Application Data\GARMIN\Devices\(Your device id).
Here you will find several folders but the one where your data is stored is "History". Hopefully here you will find a .tcx matching the date of the activity that you want to upload to GC.
Unfortunately as T SMIT has said the activity could have become corrupted and may well be in the "BadFITFiles" folder. If it is in there attach it to this thread and someone may be able to fix it for you.