Custom Post Type for Media

I am trying to figure out how to have a custom post type for the media items uploaded. Currently all media items are set to have the post_type of ‘attachment’. I would like to have a custom post type for media items uploaded so that they can be differentiated between normal media that is uploaded.

I have registered the custom post type with WordPress and I have added post_type=”my-custom-type” to my shortcode, however, it does not appear to be setting the media post type properly.

Is there a way to do this with the plugin or is the custom post type only for specifying which posts the form can appear in?