File Download DNS error?

This site can’t be reachedadditve.testapp’s DNS address could not be found. Diagnosing the problem.
DNS_PROBE_POSSIBLE

storage/app/public

filesystem.php``

 'public' => [
            'driver' => 'local',
            'root' => storage_path('app/public'),
            'url' => env('APP_URL').'app/public',
            'visibility' => 'public',
            'throw' => false,
        ],

return $form
            ->schema([
                FileUpload::make('printUrl')
                ->preserveFilenames()
                ->downloadable()
                ->label('Print')
                ->required()
                ->visibility('public'),
            ]);