1: Click the tab labeled ASSETS in the lefthand menu.
2: Click on the button labeled UPLOAD, and in the drop-down, click on SHARE UPLOADER.
3: Enter the email address(s) you wish to give access to. Separate multiple with the ENTER key, or SPACEBAR. Click SEND. These emails now have access to the project uploader, and can upload assets to it. They will receive confirmation to their inbox.