$file['name']['multi_edit'][$rownumber][$key] = [value]
$file['type']['multi_edit'][$rownumber][$key] = [value]
$file['size']['multi_edit'][$rownumber][$key] = [value]
$file['tmp_name']['multi_edit'][$rownumber][$key] = [value]
$file['error']['multi_edit'][$rownumber][$key] = [value]
becomes:
$file['name'] = [value]
$file['type'] = [value]
$file['size'] = [value]
$file['tmp_name'] = [value]
$file['error'] = [value]