To upload a car for Assetto Corsa, please follow the instructions below.

To get a mod car you have to do the following:

• Go to your control panel, click at your server, and then click at File Manager Then Click at content and then Cars.
• Make a new folder inside cars with the exact name of the modded car.
• Inside the folder you just created for the modded car, upload the data.acd file of the mod located at the car folder in your game.

Alternatively you can create the folder and upload the file with an FTP client (e.g. Filezilla) if you prefer.