Often when you work with file resources you want to import a complete folder structure.
If you like to import some javascript library or html created using a html editor.
So it would be good to select a folder and select import and after this the files are imported into files and if there is some stylesheets they are imported into stylesheets like it works when doing this using webdav.
If you like an example check out to try to import the expanded content of the tinymce zip file