You can add files to your personal file repository.
Note: Video and audio uploads through the media tool can be up to 500 MB in size.
Click the title of the file you wish to upload  and then click the Open  button to upload the file. (To upload more than one file at a time, hold down the Control key on your keyboard and click the files you wish to upload.)
A progress bar  will appear at the top of the screen, tracking the progress of your file upload.
Adding Files in Chrome, Firefox and Safari
Some web browsers (including Chrome, Firefox and Safari) contain a unique feature that enables you to add files by simply dragging and dropping them from a file window directly into the file repository. Click the file you wish to add  and drag it to your open browser  that displays the file repository. Your file will automatically upload.