Thijs,
In your project directory, you'll find a deployment directory. Open the data / files subdirectory of the deployment directory. This is where you'll need to place the contents of the files directory you retrieved from the cloud. You'll need to unpackage them all from the .tar.gz file that you've downloaded. Once you do this, the contents of the data / files directory should have a number of folders with (typically) 2 character names.
Hope that helps,
Mike