Update app.js

app.js

@@ -107,7 +107,7 @@ app.post('/onboarding/create', validateRequest, async (req, res) => {
             description,
             answers,
             stats: grading,
-            thumbnail: thumbnailBase64 ? `data:image/png;base64,${thumbnailBase64}` : null,
+            thumbnail: thumbnailBase64, // ? `data:image/png;base64,${thumbnailBase64}` : null,
             createdAt: Date.now(),
             status: "initialized"
         };