diff --git a/package.json b/package.json
index 5be84cc..0921a55 100644
--- a/package.json
+++ b/package.json
@@ -36,6 +36,7 @@
   "devDependencies": {
     "@nestjs/cli": "^11.0.21",
     "@types/jsonwebtoken": "^9.0.10",
+    "@types/multer": "^1.4.12",
     "@types/node": "^25.6.2",
     "@types/pg": "^8.20.0",
     "cross-env": "^7.0.3",
diff --git a/src/modules/whatsapp/whatsapp.service.ts b/src/modules/whatsapp/whatsapp.service.ts
index c94e433..3882bb8 100644
--- a/src/modules/whatsapp/whatsapp.service.ts
+++ b/src/modules/whatsapp/whatsapp.service.ts
@@ -118,7 +118,7 @@ export class WhatsappService {
     const mediaType = this.mimeTypeToMediaType(mimeType);
 
     const form = new FormData();
-    form.append('file', new Blob([buffer], { type: mimeType }), `media`);
+    form.append('file', new Blob([new Uint8Array(buffer)], { type: mimeType }), `media`);
     form.append('type', mimeType);
     form.append('messaging_product', 'whatsapp');