If you have a typo in your current PDF or you just wish to re-upload it without changing the URL, follow these steps:
1. From My Publications page open the collection you wish and click the Edit Settings ⚙ button of your publication.
2. Go to the RE-UPLOAD tab and either browse your new PDF file or drag and drop it.
3. After uploading your file save it by clicking the Save and close button.
4. Wait a couple of minutes for the file updating and you'll be done.