You are not allowed to restore files to this page.
No files stored on Documentation
If you upload a file with the same name an an existing file then your version will replace the old version. If "Save as" is left blank, the original filename will be used (might be ugly) . You should give it a name! Just name it whatever.jpg/png/gif (in "Save as").
Once you've selected a file on your hard disk, use "Save as" to name it whateveryouwant.png/jpg/gif. Then click "Upload" to upload the file to the page. To make an image appear on the page you need to edit the page and add the line [[Image(whatyounamedyourimage)]] where you want the image to appear. For general files, add the line [[File(whatyounamedyourfile)]] to make link to the file. That's it!