$EnableUploadvariable is true in config.php. Note that one may still need to set an upload password before users can upload (see UploadsAdmin).
'/$Group'(uploads are organized per-group), but can be set to other values for sitewide or per-page attachments.
$UploadPrefixFmt= '/$FullName'; # per-page attachments
$UploadPrefixFmt= ''; # sitewide attachments
$EnableDirectDownload=0; causes requests for attachments to be obtained via
?action=download. This allows PmWiki to protect attachments using a page's read permissions, but also increases the load on the server.
file.ext,timestamp(instead of being overwritten).
timestampis a Unix-style timestamp.
"-\w. ", which means alphanumerics, hyphens, underscores, dots, and spaces can be used in upload names, and everything else will be stripped.
$UploadNameChars= "-\w. !=+"; # allow exclamations, equals, and plus