How to upload vcf file to custom post type custom field upload file

Hi,

I am trying to create a team vcard in the team cpt. I am using custom field upload file for this purpose.

But it seems that I cannot upload vcf file as it is being greyed out and I also cannot drop the file into the field.

I understand that this could be wordpress security feature and I tried using this snippets from another site of mine that works before with toolset but is not working with metabox,

// Enable vcard upload
function enable_vcard_upload( $mime_types=array() ){
$mime_types['vcf'] = 'text/vcard';
$mime_types['vcard'] = 'text/vcard';
return $mime_types;
}
add_filter('upload_mimes', 'enable_vcard_upload' );

Any assistance on the above is appreciated.