Do not try to create nested directories with a single MKD command
The default behaviour when creating directories is to try to create the target directory including any missing directories with a single command. If this fails, the plugin will fall back to creating each directory individually. Some FTP servers, when asked to create nested directories will respond with a success code, but will not create the directories correctly. This will result in directories being created in incorrect branches of the directory tree.
This option will not prevent the creation of nested directories, it is just a fix for badly behaved FTP servers.