To minimize occurrence of this issue, might want to do some of these tasks.
But, I forgot to save it only
Ah, yes. I almost discarded a run the other day. I looked at my watch because it wanted to confirm if I wanted to discard the activity. It's hard to focus on these tough decisions in the middle of an intense run.
I accidently deleted an activity (SUP). I managed to get the file with recuva, but I can't upload it on Garmin Connect (file not supported)
Can you try to fix the file :
Some fit files can be fixed by FIT File Tools, using the section remover without any adjustments. The result can then be uploaded to Garmin Connect Web using the Import Data page. I tested your file, so this works. Then change the activity type from "Other" to "Stand Up Paddleboarding."
Not sure if that is all of it. So might need OnlyTwo
I found the missing activity but i cannot upload it to garmin connect