Update app.py

app.py

@@ -46,7 +46,10 @@ def process_upload(files):
     documents = SimpleDirectoryReader(upload_dir).load_data()
     
     global client, vector_store, storage_context, index, query_engine, memory, chat_engine
-    client = qdrant_client.QdrantClient(location=":memory:")
+    client = qdrant_client.QdrantClient(
+        path="./qdrant_db",  
+        prefer_grpc=True
+    )
     
     vector_store = QdrantVectorStore(
         collection_name="paper",