- changing the slug for an indexed folder
( I know atm it's intended to not update the ftp directory name)
- now, change the directory name in FTP to match your folder slug
- the plugin will index the renamed folder. But you lost your slugs, which results to broken links. The original slugs you wanted taken by the automatically trashed folder post.
To get the slugs for the renamed directories you have to delete the trashed folder posts and change the slugs for the newly indexed folders one-by-one. This will take a while to fix every time you rename an ftp directory.
Maybe it's better to not trash the posts if the directory deleted on the ftp. There is no way to restore this trash folder post.