Use bucket path format

src/app/api/upload/route.ts

@@ -21,11 +21,11 @@ function getR2() {
   return {
     client: new S3Client({
       region: "auto",
-      endpoint,
+      endpoint: `https://${accountId}.r2.cloudflarestorage.com`,
       credentials: { accessKeyId, secretAccessKey: secretKey },
     }),
     bucket,
-    baseUrl: endpoint,
+    baseUrl: `https://${accountId}.r2.cloudflarestorage.com/${bucket}`,
   };
 }