there is a minor issue with removeAttachment, viz. ../files/thumbs don't purge.
would be nice to rectify

here's the code I added in removeAttachment.php after line 50

$subDirectory_thumb=pq_str_replace('${attachmentDirectory}', '../files/thumbs', $obj->subDirectory);
traceLog($subDirectory_thumb); traceLog($obj->fileName);
if (file_exists( $subDirectory_thumb )) {
  array_map( 'unlink', glob($subDirectory_thumb . pq_str_replace('.', '*.', $obj->fileName) ));
  purgeFiles($subDirectory_thumb, null);
  rmdir($subDirectory_thumb);
}

regards