How do I get the file in a upload action

                Tables\Actions\Action::make('import')
                    ->form([
                        FileUpload::make('file')
                            ->label('')
                            ->acceptedFileTypes(['application/json', 'json'])
                            ->imagePreviewHeight('250')
                            ->reactive()
                            ->afterStateUpdated(function (callable $set, TemporaryUploadedFile $state) {
                                $set('fileRealPath', $state->getRealPath());
                            }),
                        Hidden::make('fileRealPath'),
                    ])
                    ->label('')
                    ->tooltip('Import')
                    ->icon('heroicon-o-folder-open')
                    ->action('import'),