NOTE: There are a number of known issues with WebDAV in Windows & Mac. The link is located under 'Step 1' on this page

Under Resources, click Upload-Download Multiple Resources NOTE: A universal step that is required for all of these instructions is to copy the listed URL of the Resources folder for the corresponding Sakai site which can be done by highlighting the URL and then copying it to your clipboard. This procedure needs to be done once for each of the Sakai sites you wish to drag and drop content to and from. NOTE: There must be at least one object (file, folder etc.) in your Sakai site Resources folder before you begin the setup procedure. Please review a couple of important notes before you begin. The WebDAV setup process is different for each operating system and does not require downloading additional software.

These instructions explain how to create a folder on your computer to allow you to drag and drop files and folders between your computer and the Sakai Resources folder in a Sakai site. This is done using a protocol called WebDAV.

Cyberduck install instructions