try updating environment variable

app.py

@@ -293,6 +293,10 @@ def ask_llm_stream(system, user_input):
     
 
 def ask_gpt(query, ui_session_id, history):
+    print(f"before: {os.environ['prompts']}")
+    os.environ['prompts'] += ', ' + query
+    print(f"after: {os.environ['prompts']}")
+
     if ui_session_id not in os.environ['users'].split(', '):
         return "Please Login", "", ""
     session_id = f"PDFAISS-{ui_session_id}"