After the reinstallation, the medals in my and the player's campaigns disappeared. The times achieved, on the other hand, remained in the Area section. I also stopped updating statistics in Ubisoft connect.
Hey Eslinka, thanks for posting and welcome to the forum.
Would you be able to check for your save game files and progress for me?
Usually you can find your save games in this default location (please change the drive letter as appropriate, to the drive letter you installed Uplay on, if you have more than one hard drive) -
C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher\savegames
They may also be located here -
Uplay - C:\Users\username\Documents\Trackmania
Epic Games Launcher - C:\Users\username\Documents\Trackmania
The cloud saving feature is automatically activated when you start a game in Uplays settings menu, but you can also untick this option to save locally on just your hard drive instead, so you may want to check if you have this option ticked in the launchers menu.
As for Ubisoft Connect, are you able to access your game page for Trackmania in the app or via the games menu?