I am trying to enable DWG MIME types for WordPress file upload, and tried applying this filter. However, because it’s the same array, it won’t work and will only apply the final one below. Wondering if there’s a way to code it to include all?

    $existing_mimes['dwg'] = 'image/vnd.dwg';
    $existing_mimes['dwg'] = 'application/acad';
    $existing_mimes['dwg'] = 'application/autocad';
    $existing_mimes['dwg'] = 'application/autocaddwg';
    $existing_mimes['dwg'] = 'application/dwg';
    $existing_mimes['dwg'] = 'drawing/dwg';
    $existing_mimes['dwg'] = 'image/dwg';

    return $existing_mimes;
}
add_filter('upload_mimes', 'custom_upload_mimes');