Having same issue. Files will not appear in the list.
First time user of the plug-in and evaluating it for my use. Conceptually it does exactly what I need with just a couple of adjustments. That said, first thing it must do correctly is upload files.
I perfer to FTP files to my site and then do tell the plug-in to read from the directory (would like to have a file browser to accomplish this instead of the manual entry).
Happy to contribute and help with testing to have that work completed.
David