Multiple file uploads

I’m trying to get this to work properly. Here’s the shortcode I’m using:

[wordpress_file_upload uploadpath=”uploads/ctuloandocs” notify=”true” attachfile=”true” duplicatespolicy=”maintain both” multiple=”true” notifyrecipients=”david@xxxxx.com,david@xxxx.us”]

1. It doesn’t allow for selecting multiple files which is important

2. I won’t upload a file with a name that already exists even though I have the duplicate file policy set to “maintain both”

How do I get these things to work?