ご返信ありがとうございます。
デバックモード確認したところ、フォーム①で使用している、必須項目が入っていなかったため確認画面に遷移されなかったようです。

この問題は解消されましたが、添付ファイルのフォームのところでエラーが出てしまいました。
以下のエラー文から何かわかることがございますでしょうか。
PHPの知見が浅く、お力をお借りしたいです。


【Stack Trace】
TypeError:
Argument 1 passed to Symfony\Bridge\Twig\Extension\AssetExtension::getAssetUrl() must be of the type string, null given, called in /home/sumamin0403/ai6kpnzn4p28.com/public_html/oyayubihime/var/cache/dev/twig/c1/c1f005b11e93db9d415eb0e56811b056ddff0ead97d2f2281000bd085cca4508.php on line 172

at vendor/symfony/twig-bridge/Extension/AssetExtension.php:49
at Symfony\Bridge\Twig\Extension\AssetExtension->getAssetUrl(null, 'save_image')
(var/cache/dev/twig/c1/c1f005b11e93db9d415eb0e56811b056ddff0ead97d2f2281000bd085cca4508.php:172)
at __TwigTemplate_586bff46671d084e6d86a92ade2da9257da8318407cd6291ddc37d92b05e818a->block_main(array('form' => object(FormView), 'Page' => object(Page), 'app' => object(AppVariable), 'BaseInfo' => object(BaseInfo), 'eccube_config' => object(EccubeConfig), 'event_dispatcher' => object(TraceableEventDispatcher), 'Layout' => object(Layout), 'title' => 'お問い合わせ2(入力ページ)', 'isMaintenance' => false, 'layoutRoleMain' => 'ec-layoutRole__main'), array('stylesheet' => array(object(__TwigTemplate_cf77c2cb2dba85217436fcbaa0f32ca0f264cd1e90f2b76615b77a93275f2aaf), 'block_stylesheet'), 'main' => array(object(__TwigTemplate_586bff46671d084e6d86a92ade2da9257da8318407cd6291ddc37d92b05e818a), 'block_main'), 'javascript' => array(object(__TwigTemplate_cf77c2cb2dba85217436fcbaa0f32ca0f264cd1e90f2b76615b77a93275f2aaf), 'block_javascript')))
(vendor/twig/twig/src/Template.php:182)
at Twig\Template->displayBlock('main', array('form' => object(FormView), 'Page' => object(Page), 'app' => object(AppVariable), 'BaseInfo' => object(BaseInfo), 'eccube_config' => object(EccubeConfig), 'event_dispatcher' => object(TraceableEventDispatcher), 'Layout' => object(Layout), 'title' => 'お問い合わせ2(入力ページ)', 'isMaintenance' => false, 'layoutRoleMain' => 'ec-layoutRole__main'), array('stylesheet' => array(object(__TwigTemplate_cf77c2cb2dba85217436fcbaa0f32ca0f264cd1e90f2b76615b77a93275f2aaf), 'block_stylesheet'), 'main' => array(object(__TwigTemplate_586bff46671d084e6d86a92ade2da9257da8318407cd6291ddc37d92b05e818a), 'block_main'), 'javascript' => array(object(__TwigTemplate_cf77c2cb2dba85217436fcbaa0f32ca0f264cd1e90f2b76615b77a93275f2aaf), 'block_javascript')))
(var/cache/dev/twig/a0/a0ed058e244cba9488f0cb73199cc2558f883534687130dd2d89bb7c9204c319.php:328)
at __TwigTemplate_cf77c2cb2dba85217436fcbaa0f32ca0f264cd1e90f2b76615b77a93275f2aaf->doDisplay(array('form' => object(FormView), 'Page' => object(Page), 'app' => object(AppVariable), 'BaseInfo' => object(BaseInfo), 'eccube_config' => object(EccubeConfig), 'event_dispatcher' => object(TraceableEventDispatcher), 'Layout' => object(Layout), 'title' => 'お問い合わせ2(入力ページ)', 'isMaintenance' => false, 'layoutRoleMain' => 'ec-layoutRole__main'), array('stylesheet' => array(object(__TwigTemplate_cf77c2cb2dba85217436fcbaa0f32ca0f264cd1e90f2b76615b77a93275f2aaf), 'block_stylesheet'), 'main' => array(object(__TwigTemplate_586bff46671d084e6d86a92ade2da9257da8318407cd6291ddc37d92b05e818a), 'block_main'), 'javascript' => array(object(__TwigTemplate_cf77c2cb2dba85217436fcbaa0f32ca0f264cd1e90f2b76615b77a93275f2aaf), 'block_javascript')))
(vendor/twig/twig/src/Template.php:405)
at Twig\Template->displayWithErrorHandling(array('form' => object(FormView), 'Page' => object(Page), 'app' => object(AppVariable), 'BaseInfo' => object(BaseInfo), 'eccube_config' => object(EccubeConfig), 'event_dispatcher' => object(TraceableEventDispatcher), 'Layout' => object(Layout), 'title' => 'お問い合わせ2(入力ページ)', 'isMaintenance' => false), array('stylesheet' => array(object(__TwigTemplate_cf77c2cb2dba85217436fcbaa0f32ca0f264cd1e90f2b76615b77a93275f2aaf), 'block_stylesheet'), 'main' => array(object(__TwigTemplate_586bff46671d084e6d86a92ade2da9257da8318407cd6291ddc37d92b05e818a), 'block_main'), 'javascript' => array(object(__TwigTemplate_cf77c2cb2dba85217436fcbaa0f32ca0f264cd1e90f2b76615b77a93275f2aaf), 'block_javascript')))
(vendor/twig/twig/src/Template.php:378)
at Twig\Template->display(array('form' => object(FormView), 'Page' => object(Page), 'app' => object(AppVariable), 'BaseInfo' => object(BaseInfo), 'eccube_config' => object(EccubeConfig), 'event_dispatcher' => object(TraceableEventDispatcher), 'Layout' => object(Layout), 'title' => 'お問い合わせ2(入力ページ)', 'isMaintenance' => false), array('main' => array(object(__TwigTemplate_586bff46671d084e6d86a92ade2da9257da8318407cd6291ddc37d92b05e818a), 'block_main')))
(src/Eccube/Twig/Template.php:41)
at Eccube\Twig\Template->display(array('form' => object(FormView), 'Page' => object(Page), 'app' => object(AppVariable), 'BaseInfo' => object(BaseInfo), 'eccube_config' => object(EccubeConfig), 'event_dispatcher' => object(TraceableEventDispatcher), 'Layout' => object(Layout), 'title' => 'お問い合わせ2(入力ページ)', 'isMaintenance' => false), array('main' => array(object(__TwigTemplate_586bff46671d084e6d86a92ade2da9257da8318407cd6291ddc37d92b05e818a), 'block_main')))
(var/cache/dev/twig/c1/c1f005b11e93db9d415eb0e56811b056ddff0ead97d2f2281000bd085cca4508.php:51)
at __TwigTemplate_586bff46671d084e6d86a92ade2da9257da8318407cd6291ddc37d92b05e818a->doDisplay(array('form' => object(FormView), 'Page' => object(Page), 'app' => object(AppVariable), 'BaseInfo' => object(BaseInfo), 'eccube_config' => object(EccubeConfig), 'event_dispatcher' => object(TraceableEventDispatcher), 'Layout' => object(Layout), 'title' => 'お問い合わせ2(入力ページ)', 'isMaintenance' => false), array('main' => array(object(__TwigTemplate_586bff46671d084e6d86a92ade2da9257da8318407cd6291ddc37d92b05e818a), 'block_main')))
(vendor/twig/twig/src/Template.php:405)
at Twig\Template->displayWithErrorHandling(array('form' => object(FormView), 'Page' => object(Page), 'app' => object(AppVariable), 'BaseInfo' => object(BaseInfo), 'eccube_config' => object(EccubeConfig), 'event_dispatcher' => object(TraceableEventDispatcher), 'Layout' => object(Layout), 'title' => 'お問い合わせ2(入力ページ)', 'isMaintenance' => false), array('main' => array(object(__TwigTemplate_586bff46671d084e6d86a92ade2da9257da8318407cd6291ddc37d92b05e818a), 'block_main')))
(vendor/twig/twig/src/Template.php:378)
at Twig\Template->display(array('form' => object(FormView), 'Page' => object(Page)), array())
(src/Eccube/Twig/Template.php:41)
at Eccube\Twig\Template->display(array('form' => object(FormView), 'Page' => object(Page)))
(vendor/twig/twig/src/Template.php:390)
at Twig\Template->render(array('form' => object(FormView), 'Page' => object(Page)), array())
(vendor/twig/twig/src/TemplateWrapper.php:45)
at Twig\TemplateWrapper->render(array('form' => object(FormView), 'Page' => object(Page)))
(vendor/twig/twig/src/Environment.php:318)
at Twig\Environment->render('Contact2/confirm.twig', array('form' => object(FormView), 'Page' => object(Page)))
(vendor/symfony/framework-bundle/Controller/AbstractController.php:258)
at Symfony\Bundle\FrameworkBundle\Controller\AbstractController->renderView('Contact2/confirm.twig', array('form' => object(FormView), 'Page' => object(Page)))
(vendor/symfony/framework-bundle/Controller/AbstractController.php:266)
at Symfony\Bundle\FrameworkBundle\Controller\AbstractController->render('Contact2/confirm.twig', array('form' => object(FormView), 'Page' => object(Page)))
(app/Customize/Controller/Contact2Controller.php:100)
at Customize\Controller\Contact2Controller->index(object(Request))
(vendor/symfony/http-kernel/HttpKernel.php:163)
at Symfony\Component\HttpKernel\HttpKernel->handleRaw(object(Request), 1)
(vendor/symfony/http-kernel/HttpKernel.php:75)
at Symfony\Component\HttpKernel\HttpKernel->handle(object(Request), 1, true)
(vendor/symfony/http-kernel/Kernel.php:202)
at Symfony\Component\HttpKernel\Kernel->handle(object(Request))
(index.php/:83)