//Upload Custom File Types
function my_custom_mime_types($mimes)
{
$mimes['ai'] = 'application/postscript'; //Adobe Illustrator
$mimes['indd'] = 'application/postscript'; // Adobe InDesign
$mimes['ofm'] = 'application/postscript'; // Embroidery
$mimes['dst'] = 'application/postscript'; // Embroidery
return $mimes;
}
add_filter('upload_mimes', 'my_custom_mime_types');