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; }