Upload

function my_myme_types( $mime_types ) {
	$mime_types['svg'] = 'image/svg+xml'; //Adding svg extension
	$mime_types['psd'] = 'image/vnd.adobe.photoshop'; //Adding photoshop files
	
	return $mime_types;
}

add_filter( 'upload_mimes', 'my_myme_types', 1, 1 );