Manual:$wgUploadDirectory/nl

Details
The file system path of the folder where uploaded files will be stored.

If this variable is changed, you may need to update accordingly.

This location needs to be writable by the web server. See Manual:Configuring file uploads#Check directory security.

By default, uploaded files are actually stored in subfolders of $wgUploadDirectory. See Manual:Configuring file uploads#Upload directory for information, and how to disable this behavior.