multiple file upload - missing some files

     FileUpload::make('attachments')
                        ->columnSpan(12)
                        ->multiple()
                        ->maxSize(100000)
                        ->disk('uploads')
                        ->visibility('private')
                        ->directory('application_files')
                        ->getUploadedFileNameForStorageUsing(function ($file): string {
                            $fileName = str($file->getClientOriginalName());

                            $fileName_str = preg_replace('/[^a-zA-Z0-9.]/','',iconv('UTF-8', 'ASCII//TRANSLIT',  $fileName));
                            return (string) str($fileName_str)->prepend(now() . '-');
                        })
                        ->downloadable()
                        ->rules([ new MalwareFile] )
                        ->label(__('application.resource.application_documents')),