In order to upload a file, follow the steps below:

Click +Add while on File Uploads tab. You can select Folder to create a folder to organize your files. To create a new locator, select File. You can also upload multiple files together at the same time by selecting Multiple Files.
This will open up the File Uploads tab:
At this point, click on the New File to upload a file which opens up the New File tab shown above. Select the file to upload and click on the Save button.
In case you are uploading a file that already exists, you will be presented with an override warning to which you can accept or cancel.

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