diff --git a/src/Entity/Action.php b/src/Entity/Action.php
index abb4079..467c90a 100644
--- a/src/Entity/Action.php
+++ b/src/Entity/Action.php
@@ -14,6 +14,12 @@ abstract class Action extends Entity
         ?string $url = null,
         array $files = [],
     ) {
+        foreach ($files as $i => $file) {
+            if (isset($file['content'])) {
+                $files[$i]['content'] = base64_encode($file['content']);
+            }
+        }
+
         return [
             'json' => [
                 'type' => 'action',