Yeah, it's not working.
You could try
Quickoffice Files from the App Store for $2. It will attach & send multiple files of any type.
The only problem is that it will only send attachments located in /var/mobile/Applications/xxxxxxxx/Documents
xxxxxxxx being the Quickoffice application folder which you'll have to locate (look for the folder containing Quickfiles.app using iFile) & save above folder to bookmarks.
You can then move any files you want to send into the above folder (again using the iFile bookmark & cut & paste) and then open Quickoffice Files and send.
Anyone one know of a simpler way?