Please try below code and check if ‘sound_s‘ key exists in the array or not
$file_id = get_post_meta($post_id);
echo "<pre>";
print_r( $file_id );
exit;
Please try below code and check if ‘sound_s‘ key exists in the array or not
$file_id = get_post_meta($post_id);
echo "<pre>";
print_r( $file_id );
exit;