You can very easily upload files of types jpg, png, zip, pdf, doc, gz and txt files on to wiki by using the Upload file page. The maximum size of the file that can be uploaded is restricted to 50 MB. In order to upload a file you need to have an accout on the wiki. Once the file is posted, it can be easily linked on any of the wiki pages. You can view the list of files uploaded in the past by going to this page.