Current configuration does not allow embedding of the file grade.ods because of its mimetype application/vnd.oasis.opendocument.spreadsheet.: grade.ods
Attached FilesTo refer to attachments on a page, use attachment:filename, as shown below in the list of files. Do NOT use the URL of the [get] link, since this is subject to change and can break easily.
You are not allowed to attach a file to this page.