Update app.py

app.py

@@ -1579,7 +1579,7 @@ def process_pdf(pdf_file):
     # Embed and upload the chunks into the vector database
     chunk_ids = []
     for chunk in chunks:
-        chunk_id = vector_store.add_documents([chunk])
+        chunk_id = vectorstore.add_documents([chunk])
         chunk_ids.append(chunk_id)
 
     return f"Uploaded {len(chunks)} chunks to the vector database."