Eventually, Garmin Connect is forcing all users to use Modern over Classic. Unfortunately, in the new Modern version, they are removing the manual Upload button completely, and all users are forced to use Garmin Express.
This completely screws over Linux users since Garmin Express only works on Windows and Mac OS X, and I rely on the manual Upload button.
If this is the case, I'll have to switch to another website to store all of my data, but I'd like to keep using Garmin Connect since it already has everything....