From the "Workspace" homepage, click on the green "Manage" button located under the "Files" tab.
You will be directed to the Workspace File Manager screen of the associated deal. If you are the Admin / Contributor of the Workspace, locate the file you wish to delete and click on the "Delete" button.
Click on "Yes" button on the prompt to complete file deletion. NOTE: Files can be re-added if deleted, by using the "Upload File" option.
Workspace File Manager will now show that your file has been deleted successfully. You will receive a green "Event Delete File" Notification in the top right corner of your Workspace File Manager screen which also confirms that the deletion has been audited.