@larsjuul. Easy Folder LIsting Pro doesn’t do file uploads. Easy Flash Uploader and Easy File Uploader do.
In terms of the demo… that is an interesting request. However, because it is a demo site, I really can’t allow users to actually upload files to my server. So, the demo shows how the plugin works, but deletes the uploaded file instead of copying it to the specified location.
However, it is certainly possible to use Easy Flash Uploader or Easy File Uploader to upload files to a folder that Easy Folder Listing or Easy Folder Listing Pro is monitoring as the source of a listing.
So, the short answer to your question is YES.