I am trying to import multiple years of fitbit data via CSV to Garmin Connect. (I'm not interested in the xls or xlsx format.)
Date,Weight,BMI,Fat
01-11-2019,77.5,25.84,0

I am trying to import multiple years of fitbit data via CSV to Garmin Connect. (I'm not interested in the xls or xlsx format.)
Date,Weight,BMI,Fat
01-11-2019,77.5,25.84,0
If it is not you, who posted in the following thread just now, it will help you:
BTW, it is redundant to send the BMI to Garmin, because it calculates it itself anyway. And since you are not sending the fat value either (just a zero), you can save you the work, and be sending just the weight alone. And in such case it would be probably much quicker entering the weight directly on the main page - it would save you all the hassle with the file import.
But perhaps in reality you are sending much more data, in wich case the import is inevitable, of course.