Activity sync failed to the app, then a day later disappeared from the watch

Question

I just finished my first Ironman. Activity wasn't syncing to the app. Now a day later it disappeared from the watch too. How I can restore it and sync?

Garmin-Laurie · Accepted Answer

If you are seeing the FIT file available on the device, you can try the steps for manually importing the activity to Connect. How Do I Manually Upload an Activity I Recorded to Garmin Connect? If this is still not appearing in the Connect account after attempting the manual import, this likely would indicate the file is corrupted to the point Connect cannot read it. 
 I do recommend deleting the activity file from the watch, whether it is uploaded or not. As if this is corrupted, you do not want to have this effect future activities. 
 If once you have this removed, you are still having trouble syncing new activities with the Connect app and Garmin Express, I would recommend reaching out to Garmin Support.

Garmin-Laurie · Answer

7760970 said: It's great to hear that it seems to be normal issue you don't even bother to care. It's great to hear to it's so fine for you that you don't even bother to investigate the problem. Or raise it anywhere, try to fix it. But let's start with couple of questions: 
 - How do you know the file is gone? 
 - Why the file is gone? 
 Again, I am very sorry to hear this occurred. While not so normal as to be expected, corrupted files can occur. 
 To address your questions: 
 Why the file is gone? In some cases this can be avoided by syncing regularly, and deleting older activities stored from the watch. Other times, this may be entirely random due to, for example, a shut down of the device during the activity. If this is the only time you experience this, there really will not be a way to for us to tell you for sure the cause. 
 However, if this is something that is happening repeatedly, this can indicate a larger software problem with the watch. I truly hope this is only a one off (while still devastating) , not something ongoing. 
 How do you know the file is gone? I did not ask this, as you had already mentioned that this was not appearing in the Connect account after the sync or the watch itself. But just to be sure, on your watch: Hold the menu button, select History, then Activities. See if you are able to locate the file. 
 If it is present, you can try using these steps to import the file: How Do I Manually Upload an Activity I Recorded to Garmin Connect? 
 If this is not listed in the watch history, there is nowhere else this will appear for you to recover this, unfortunately.

Activity sync failed to the app, then a day later disappeared from the watch

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