WWF uses third party upload components that may be installed on your hosts server.
In component file uploading, files are selected in a single HTML form via <INPUT TYPE="FILE"> controls - only one component per form.
Among the limitations common to upload components are:
- Only one file can be selected at a time and uploaded - no way for a component to grab a list of fully qualified paths to file on the user's PC.
- There is no way to select an entire folder.
- The Select File dialog cannot be customized (e.g. it cannot be configured to display images only).
While it might be possible to use the component to gather a list of files, then coding a subroutine to iterate through the list ad feed it back to the component to download each file in the list, it would need some end-user instructions and some method of notifying them how far along they are in the list. I think it would cause more end-user confusion and frustration than it would be worth - even if it is do-able. It's a lot more work than changing a few lines of code in one file.