diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9f047633..aff59a03 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+## [v2.1.48](https://github.com/roadiz/core-bundle-dev-app/compare/v2.1.47...v2.1.48) (2023-10-20)
+
+
+### Bug Fixes
+
+* **CustomForm:** Catch mailer transport exception when submitting custom-form answers ([52487e3](https://github.com/roadiz/core-bundle-dev-app/commit/52487e3b1ef626a771f382d9eb5b25d75ea2d483))
+
 ## [v2.1.47](https://github.com/roadiz/core-bundle-dev-app/compare/v2.1.46...v2.1.47) (2023-10-09)
 
 
diff --git a/lib/RoadizCoreBundle/src/Controller/CustomFormController.php b/lib/RoadizCoreBundle/src/Controller/CustomFormController.php
index eefdcd57..d1e749cf 100644
--- a/lib/RoadizCoreBundle/src/Controller/CustomFormController.php
+++ b/lib/RoadizCoreBundle/src/Controller/CustomFormController.php
@@ -158,7 +158,7 @@ public function definitionAction(Request $request, int $id): JsonResponse
      * @param Request $request
      * @param int $id
      * @return Response
-     * @throws Exception
+     * @throws Exception|FilesystemException
      */
     public function postAction(Request $request, int $id): Response
     {
@@ -221,8 +221,10 @@ public function postAction(Request $request, int $id): Response
      * @param Request $request
      * @param int $customFormId
      * @return Response
-     * @throws Exception
-     * @throws TransportExceptionInterface
+     * @throws FilesystemException
+     * @throws LoaderError
+     * @throws RuntimeError
+     * @throws SyntaxError
      */
     public function addAction(Request $request, int $customFormId): Response
     {
@@ -276,6 +278,7 @@ public function sentAction(Request $request, int $customFormId): Response
      * @throws LoaderError
      * @throws RuntimeError
      * @throws SyntaxError
+     * @deprecated Use async message handler to send email receipt from CustomFormAnswer.
      */
     public function sendAnswer(
         CustomFormAnswer $answer,
@@ -335,10 +338,7 @@ public function sendAnswer(
      * @param string|null $emailSender
      * @param bool $prefix
      * @return array|Response
-     * @throws LoaderError
-     * @throws RuntimeError
-     * @throws SyntaxError
-     * @throws TransportExceptionInterface
+     * @throws SyntaxError|RuntimeError|LoaderError|FilesystemException
      */
     public function prepareAndHandleCustomFormAssignation(
         Request $request,
@@ -378,17 +378,6 @@ public function prepareAndHandleCustomFormAssignation(
                     $answer->toArray(false)
                 );
 
-                $msg = $this->translator->trans(
-                    'customForm.%name%.send',
-                    ['%name%' => $customFormsEntity->getDisplayName()]
-                );
-
-                $session = $request->getSession();
-                if ($session instanceof Session) {
-                    $session->getFlashBag()->add('confirm', $msg);
-                }
-                $this->logger->info($msg);
-
                 $assignation['title'] = $this->translator->trans(
                     'new.answer.form.%site%',
                     ['%site%' => $customFormsEntity->getDisplayName()]
@@ -403,25 +392,46 @@ public function prepareAndHandleCustomFormAssignation(
                 /*
                  * Send answer notification
                  */
-                $receiver = array_filter(
-                    array_map('trim', explode(',', $customFormsEntity->getEmail() ?? ''))
-                );
-                $receiver = array_map(function (string $email) {
-                    return new Address($email);
-                }, $receiver);
-                $this->sendAnswer(
-                    $answer,
-                    [
-                        'mailContact' => $assignation['mailContact'],
-                        'fields' => $assignation["emailFields"],
-                        'customForm' => $customFormsEntity,
-                        'title' => $this->translator->trans(
-                            'new.answer.form.%site%',
-                            ['%site%' => $customFormsEntity->getDisplayName()]
-                        ),
-                    ],
-                    $receiver
-                );
+                try {
+                    $receiver = array_filter(
+                        array_map('trim', explode(',', $customFormsEntity->getEmail() ?? ''))
+                    );
+                    $receiver = array_map(function (string $email) {
+                        return new Address($email);
+                    }, $receiver);
+                    $this->sendAnswer(
+                        $answer,
+                        [
+                            'mailContact' => $assignation['mailContact'],
+                            'fields' => $assignation["emailFields"],
+                            'customForm' => $customFormsEntity,
+                            'title' => $this->translator->trans(
+                                'new.answer.form.%site%',
+                                ['%site%' => $customFormsEntity->getDisplayName()]
+                            ),
+                        ],
+                        $receiver
+                    );
+
+                    $msg = $this->translator->trans(
+                        'customForm.%name%.send',
+                        ['%name%' => $customFormsEntity->getDisplayName()]
+                    );
+
+                    $session = $request->getSession();
+                    if ($session instanceof Session) {
+                        $session->getFlashBag()->add('confirm', $msg);
+                    }
+                    $this->logger->info($msg);
+                } catch (TransportExceptionInterface $e) {
+                    // Do not fail if answer has been registered but email has not been sent.
+                    $this->logger->warning('Custom form answer has been registered but email could not been sent.', [
+                        'exception' => $e,
+                        'message' => $e->getMessage(),
+                        'customForm' => $customFormsEntity->getDisplayName(),
+                        'answerId' => $answer->getId()
+                    ]);
+                }
 
                 return $response;
             } catch (EntityAlreadyExistsException $e) {
diff --git a/lib/RoadizCoreBundle/src/Document/MessageHandler/AbstractLockingDocumentMessageHandler.php b/lib/RoadizCoreBundle/src/Document/MessageHandler/AbstractLockingDocumentMessageHandler.php
index 13988320..e15c6139 100644
--- a/lib/RoadizCoreBundle/src/Document/MessageHandler/AbstractLockingDocumentMessageHandler.php
+++ b/lib/RoadizCoreBundle/src/Document/MessageHandler/AbstractLockingDocumentMessageHandler.php
@@ -47,6 +47,8 @@ public function __invoke(AbstractDocumentMessage $message): void
 
     protected function isFileLocal(DocumentInterface $document): bool
     {
-        return str_starts_with($this->documentsStorage->publicUrl($document->getMountPath()), '/');
+        return
+            $document->isPrivate() ||
+            str_starts_with($this->documentsStorage->publicUrl($document->getMountPath()), '/');
     }
 }
diff --git a/lib/RoadizCoreBundle/src/Form/CustomFormsType.php b/lib/RoadizCoreBundle/src/Form/CustomFormsType.php
index 7c9fac62..5cd0711c 100644
--- a/lib/RoadizCoreBundle/src/Form/CustomFormsType.php
+++ b/lib/RoadizCoreBundle/src/Form/CustomFormsType.php
@@ -141,38 +141,21 @@ protected function addSingleField(FormBuilderInterface $builder, CustomFormField
      */
     protected function getTypeForField(CustomFormField $field): string
     {
-        switch ($field->getType()) {
-            case AbstractField::ENUM_T:
-            case AbstractField::MULTIPLE_T:
-            case AbstractField::RADIO_GROUP_T:
-            case AbstractField::CHECK_GROUP_T:
-                return ChoiceType::class;
-            case AbstractField::DOCUMENTS_T:
-                return FileType::class;
-            case AbstractField::MARKDOWN_T:
-                return MarkdownType::class;
-            case AbstractField::COLOUR_T:
-                return ColorType::class;
-            case AbstractField::DATETIME_T:
-                return DateTimeType::class;
-            case AbstractField::DATE_T:
-                return DateType::class;
-            case AbstractField::RICHTEXT_T:
-            case AbstractField::TEXT_T:
-                return TextareaType::class;
-            case AbstractField::BOOLEAN_T:
-                return CheckboxType::class;
-            case AbstractField::INTEGER_T:
-                return IntegerType::class;
-            case AbstractField::DECIMAL_T:
-                return NumberType::class;
-            case AbstractField::EMAIL_T:
-                return EmailType::class;
-            case AbstractField::COUNTRY_T:
-                return CountryType::class;
-            default:
-                return TextType::class;
-        }
+        return match ($field->getType()) {
+            AbstractField::ENUM_T, AbstractField::MULTIPLE_T, AbstractField::RADIO_GROUP_T, AbstractField::CHECK_GROUP_T => ChoiceType::class,
+            AbstractField::DOCUMENTS_T => FileType::class,
+            AbstractField::MARKDOWN_T => MarkdownType::class,
+            AbstractField::COLOUR_T => ColorType::class,
+            AbstractField::DATETIME_T => DateTimeType::class,
+            AbstractField::DATE_T => DateType::class,
+            AbstractField::RICHTEXT_T, AbstractField::TEXT_T => TextareaType::class,
+            AbstractField::BOOLEAN_T => CheckboxType::class,
+            AbstractField::INTEGER_T => IntegerType::class,
+            AbstractField::DECIMAL_T => NumberType::class,
+            AbstractField::EMAIL_T => EmailType::class,
+            AbstractField::COUNTRY_T => CountryType::class,
+            default => TextType::class,
+        };
     }
 
     /**
@@ -249,6 +232,10 @@ protected function getOptionsForField(CustomFormField $field, array $formOptions
                 $mimeTypes = [
                     'application/pdf',
                     'application/x-pdf',
+                    'image/avif',
+                    'image/heif',
+                    'image/heic',
+                    'image/webp',
                     'image/jpeg',
                     'image/png',
                     'image/gif',
@@ -260,7 +247,7 @@ protected function getOptionsForField(CustomFormField $field, array $formOptions
                 $option['constraints'][] = new All([
                     'constraints' => [
                         new File([
-                            'maxSize' => '10m',
+                            'maxSize' => $formOptions['fileUploadMaxSize'],
                             'mimeTypes' => $mimeTypes
                         ])
                     ]
@@ -309,12 +296,15 @@ public function configureOptions(OptionsResolver $resolver): void
             'recaptcha_name' => Recaptcha::FORM_NAME,
             'forceExpanded' => false,
             'csrf_protection' => false,
+            // You may reduce this value when you have multiple files upload fields
+            // to avoid hitting email server upload limit.
+            'fileUploadMaxSize' => '10m',
         ]);
 
         $resolver->setRequired('customForm');
-
         $resolver->setAllowedTypes('customForm', [CustomForm::class]);
         $resolver->setAllowedTypes('forceExpanded', ['boolean']);
+        $resolver->setAllowedTypes('fileUploadMaxSize', ['string']);
         $resolver->setAllowedTypes('recaptcha_name', ['string']);
     }