Save Session in multi step form

I follow this https://5balloons.info/multi-page-step-form-in-laravel-with-validation/ to create a multi step form. I try to save all inputs in Session and at end save in DB. I want, if i back to last step, The fields are filled with the data already given. But when i back, it gives me just number 1 in every field, that i gieved some data.

thanks for any help. that is my Controller:

public function createStepTwo(Request $request)
    {
        $register = $request->session()->get('register');
        $countries = CountryListFacade::getList('en');
        return view('wizard.step_two', compact('countries'), compact('register', $register));
    }

    public function createTwo(Request $request)
    {

        $data = $request->validate([
            'another' => '',
            'name' => 'required',
            'address_one' => 'required',
            'address_two' => 'string|nullable',
            'zip' => 'required|numeric',
            'city' => 'required',
            'state' => 'string',
            'country' => 'required',
        ]);
        auth()->user()->company()->create($data);
        // $company_id = auth()->user()->company()->id;
        // DB::table('users')->where('id', auth()->id())->update(['company_id' => $company_id]);
        if (empty($request->session()->get('product'))) {
            $register = new Companies();
            $register->fill($data);
            $request->session()->put('register', $register);
        } else {
            $register = $request->session()->get('register');
            $register->fill($data);
            $request->session()->put('register', $register);
        }
        return dd($register);
        //return redirect('/step_three');
    }

that my blade:

<div class="two-account-setup-2">
    <div class="two-navigation-icons">
        <a href=" {{ route('step_one') }}" class="two-backicon">
            <img alt="" class="two-vector" src="https://static.overlay-tech.com/assets/f37996f4-4702-42c3-a453-1efaa4666126.svg" />
        </a>
    </div>
    <img alt="" class="two-independesk-logo" src="https://static.overlay-tech.com/assets/8e30a44f-b89a-4d36-86e1-65bc733ab54c.svg" />
    <form method="POST" action="{{ route('step_two') }}">
        @csrf
        @if($errors->any())
        @foreach($errors->all() as $error)
        <li>{{ $error }}</li>
        @endforeach
        @endif
        <div class="two-description">
            <div class="two-progress-bar">
                <p class="two-progress-status">{{__('Settings')}}</p>
                <p class="two-progress-status-two">{{__('Step:')}} 2 {{__('of')}} 5</p>
            </div>
            <p class="two-setup1-description">
                {{__('Please enter your company data:')}}
            </p>
        </div>
        <div class="two-input-container">
            <div class="two-companyname-input">
                <p class="two-fieldlabel-companyname">{{__('Company name')}}</p>
                <input class="two-field" placeholder="{{__('Company name')}}" name="name" value="{{ $register->name or '' }}" />
            </div>
            <div class="two-companyname-input">
                <p class="two-fieldlabel-companyname">{{__('Address 1')}}</p>
                <input class="two-field-two" placeholder="{{__('Address 1')}}" name="address_one" value="{{ $register->address_one or '' }}" />
            </div>
            <div class="two-companyname-input">
                <p class="two-fieldlabel-companyname">{{__('Address 2')}}</p>
                <input class="two-field-two" placeholder="{{__('Address 2')}}" name="address_two" value="{{ $register->address_two or '' }}" />
            </div>
            <div class="two-companyname-input">
                <p class="two-fieldlabel-companyname">{{__('Zip code')}}</p>
                <input class="two-field-three" placeholder="{{__('Zip code')}}" name="zip" value="{{ $register->zip or '' }}" />
            </div>
            <div class="two-companyname-input">
                <p class="two-fieldlabel-companyname">{{__('City')}}</p>
                <input class="two-field-three" placeholder="{{__('City')}}" name="city" value="{{ $register->city or '' }}" />
            </div>
            <div class="two-state-input">
                <p class="two-fieldlabel-state">{{__('State')}}</p>
                <input class="two-field-three" placeholder="{{__('State')}}" name="state" value="{{ $register->state or '' }}" />
            </div>
            <div class="two-country-input">
                <p class="two-fieldlabel-country">{{__('Country')}}</p>
                <div class="two-field-wrapper">
                    <select class="two-field-four" name="country">
                        <option value="">{{__('Country')}}</option>
                        @foreach ($countries as $country)
                        <option value="{{ $country }}">{{ $country }}</option>
                        @endforeach

                    </select>
                </div>
            </div>
        </div>
        <div class="two-buttons">
            <a style="text-decoration: none;" href=" {{ route('step_one') }}">
                <button type="button" class="one-back">
                    <p class="one-label-three">{{__('Back')}}</p>
                </button>
            </a>
            <button type="submit" class="continue">
                <p class="label-two">{{__('Next')}}</p>
            </button>
        </div>
    </form>
</div>

and that is my output dd($register):

App\Models\Companies {#1336 ▼
  #guarded: []
  #connection: null
  #table: null
  #primaryKey: "id"
  #keyType: "int"
  +incrementing: true
  #with: []
  #withCount: []
  +preventsLazyLoading: false
  #perPage: 15
  +exists: false
  +wasRecentlyCreated: false
  #escapeWhenCastingToString: false
  #attributes: array:7 [▼
    "name" => "someName"
    "address_one" => "someAddress"
    "address_two" => "sadaww"
    "zip" => "12345"
    "city" => "Berlin"
    "state" => "berlin"
    "country" => "Germany"
  ]
  #original: []
  #changes: []
  #casts: []
  #classCastCache: []
  #attributeCastCache: []
  #dates: []
  #dateFormat: null
  #appends: []
  #dispatchesEvents: []
  #observables: []
  #relations: []
  #touches: []
  +timestamps: true
  #hidden: []
  #visible: []
  #fillable: []
}