Add Multiple Attachments at once

Webmin 1.780
Usermin 1.690

A usermin User would like to add multiple (sometimes as many as 20 small attachments to a single email.

In gmail/yahoo/etc you can click add attachments and use windows (or other OS) to select multiple files. These are then added as separate attachments.

Is there a method to do this in Usermin??

If not, a Hack??

Thank you!