diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3356375d..a4697af6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 ### Fixed
 
+- Fixed a bug in which the content column was not being populated for elements in non primary sites after upgrading from Campaign 2 ([#470](https://github.com/putyourlightson/craft-campaign/issues/470)).
 - Fixed the PHPDoc type for relation field values.
 
 ## 3.1.1 - 2024-04-16
diff --git a/src/Campaign.php b/src/Campaign.php
index a14d897b..e1db6450 100644
--- a/src/Campaign.php
+++ b/src/Campaign.php
@@ -180,7 +180,7 @@ public static function editions(): array
     /**
      * @inheritdoc
      */
-    public string $schemaVersion = '3.0.0.3';
+    public string $schemaVersion = '3.1.2';
 
     /**
      * @inheritdoc
diff --git a/src/migrations/m240502_120000_content_refactor_elements_non_primary_sites.php b/src/migrations/m240502_120000_content_refactor_elements_non_primary_sites.php
new file mode 100644
index 00000000..ffcc6e10
--- /dev/null
+++ b/src/migrations/m240502_120000_content_refactor_elements_non_primary_sites.php
@@ -0,0 +1,72 @@
+<?php
+
+namespace putyourlightson\campaign\migrations;
+
+use Craft;
+use craft\migrations\BaseContentRefactorMigration;
+use putyourlightson\campaign\Campaign;
+use putyourlightson\campaign\elements\CampaignElement;
+use putyourlightson\campaign\elements\MailingListElement;
+use putyourlightson\campaign\elements\SegmentElement;
+use putyourlightson\campaign\elements\SendoutElement;
+
+class m240502_120000_content_refactor_elements_non_primary_sites extends BaseContentRefactorMigration
+{
+    /**
+     * @inheritdoc
+     */
+    public function safeUp(): bool
+    {
+        $primarySiteId = Craft::$app->getSites()->getPrimarySite()->id;
+
+        foreach (Campaign::$plugin->campaignTypes->getAllCampaignTypes() as $campaignType) {
+            if ($campaignType->siteId !== $primarySiteId) {
+                $this->updateElements(
+                    CampaignElement::find()
+                        ->campaignType($campaignType)
+                        ->siteId($campaignType->siteId)
+                        ->ids(),
+                    $campaignType->getFieldLayout(),
+                );
+            }
+        }
+
+        foreach (Campaign::$plugin->mailingListTypes->getAllMailingListTypes() as $mailingListType) {
+            if ($mailingListType->siteId !== $primarySiteId) {
+                $this->updateElements(
+                    MailingListElement::find()
+                        ->mailingListType($mailingListType)
+                        ->siteId($mailingListType->siteId)
+                        ->ids(),
+                    $mailingListType->getFieldLayout(),
+                );
+            }
+        }
+
+        $this->updateElements(
+            SegmentElement::find()
+                ->siteId(['not', $primarySiteId])
+                ->ids(),
+            Craft::$app->getFields()->getLayoutByType(SegmentElement::class),
+        );
+
+        $this->updateElements(
+            SendoutElement::find()
+                ->siteId(['not', $primarySiteId])
+                ->ids(),
+            Craft::$app->getFields()->getLayoutByType(SendoutElement::class),
+        );
+
+        return true;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function safeDown(): bool
+    {
+        echo self::class . " cannot be reverted.\n";
+
+        return false;
+    }
+}