## ❌ Upvoting PYQ Fails – `branch` field casting error

🐛 Description:

When trying to upvote a PYQ, a 400 Bad Request error is returned from the backend. The response suggests a validation failure related to the branch field.

---

💥 Error (from network tab):

{
  "error": "Failed to upvote PYQ",
  "details": "pyqs validation failed: branch: Cast to ObjectId failed for value \"CSE\" (type string) at path \"branch\" because of \"BSONError\""
}