Directory Smush doesn't show my image folders

Hi,
When I try to use the Directory Smush function in WP Smush Pro, I don't see my image folders: https://www.screencast.com/t/CZzLqdCg
The image folders, however, are there (with the right permissions), when viewing the file structure using an FTP client: https://www.screencast.com/t/yxs1B8PeEE
Please advise.
Thank you!