Share files the BuddyPress way!
You can download and install BuddyDriveS3 using the built in WordPress plugin installer. If you download BuddyDriveS3 manually, make sure it is uploaded to "/wp-content/plugins/buddydrive/".
Activate BuddyDrive in the "Plugins" admin panel using the "Network Activate" (or "Activate" if you are not running a network) link.
Please note: it can't work along with original plugin at the same time! You have to "Deactivate" BuddyDrive if you have it installed and active, then "Activate" BuddyDriveS3.
You will have an option to Move existing BuddyDrive files to Amazon S3 storage from "Settings" page.