File upload not returning url after upload

->form([
    TextInput::make('to')->default($this->->user->name.' ('.$this->user->email.')')->disabled(),
    TextInput::make('subject')->required(),
    Textarea::make('message')->required(),
    FileUpload::make('files')->label('Attachments')
            ->directory(fn ($record) => 'message_attachments/'.$record->id)->visibility('private')->multiple()      
]),

->action(function ($data): void {
      dd($data);
      ...

array:3 [▼ // app\Filament\Pages\Message.php:55
  "subject" => "aa"
  "message" => "a"
  "files" => []
]

FILAMENT_FILESYSTEM_DISK=local