Use the File Manager to upload files & insert links in Comments/ Instructions/ Feedback to the files. You can also delete unused files to save space. Make sure there are no existing links to them or users will get errors when they click on those links.
Links can be to external files kept on another server/ website. In such cases make sure that the external sites are available to users. Otherwise they will get errors when they click on such links.
Links will be inserted as plain hypertext links. So if you say link to a Word document, make sure that users have Word installed. Otherwise when they click on the link they will just get a download or errors.
