Image Relay supports a WebDAV interface for all of your assets, which is similar to FTP. This allows you do do many useful things, one of which is mass uploading of folders and subfolders of assets.
To upload assets to Image Relay via WebDAV, you first need a WebDAV upload client. There are a few free clients available for both Windows and Mac.
One option we recommend is Cyberduck.
Open Cyberduck, and click New Bookmark
Fill out the connection details that correspond with your Image Relay account.
Then double click on the new bookmark and launch.
Now you may drag and drop files and folders to upload them to Image Relay. Or download folders structures as well.
N.B. You cannot use this interface to move assets around in your Image Relay library, only to upload or download.