Wordpress allow uploads other file types

source: https://www.tweaking4all.com/web-development/wordpress/wordpress-upload-banned-file-types/

Add to theme function.php:

add_filter('upload_mimes', 't4a_add_custom_upload_mimes');

function t4a_add_custom_upload_mimes($existing_mimes){
    return array_merge($existing_mimes, array(
        'csv' => 'application/octet-stream',
        'xml' => 'application/atom+xml',
        '7z' => 'application/x-7z-compressed',
        'rar' => 'package/rar',
        'tar' => 'package/x-tar',
        'tgz' => 'application/x-tar-gz',
        'apk' => 'application/vnd.android.package-archive',
        'zip' => 'package/zip',
        'img|iso' => 'package/img',
        'gz|gzip' => 'package/x-gzip',
        'deb|rpm' => 'package/x-app',
        'ttf|woff' => 'application/x-font') );
    return $existing_mimes;
}