File Type Error: application/octet-stream

Not really sure how to solve this.

Apparently, 7z files aren’t being recognized.

Tried adding

add_filter( 'prso_adv_uploader_reject_mimes', 'prso_uploader_add_mime' );
    function prso_uploader_add_mime( $allowed_mime_types ) {

    $allowed_mime_types['7z'] = 'application/x-7z-compressed';

    return $allowed_mime_types;
    }

To the functions.php of my theme, but this still didn’t resolve the issue.

Any help with adding this mime type to the site would be appreciated.

https://www.ads-software.com/plugins/gravity-forms-advanced-file-uploader/