Click the Add files button, navigate to the files you want to upload, select them, and click the Open button. After you add all of the files that you want to upload, click the Start upload button.
If your internet browser supports HTML 5, the words "Drag files here" appear in the upload section. You can upload files by opening Windows Explorer, navigating to the files you want to upload, selecting the files, and dragging the files to the file list. After you add all of the files that you want to upload, click the Start upload button.
If the files you need to upload are in Dropbox, click Choose from Dropbox at the bottom of the upload dialog, navigate to and select the files you want to upload, and click the Choose button.