few updates

app.py

@@ -23,7 +23,9 @@ user_api = {}
 
 def set_apikey(state, api_key):
 
-        if state not in user_app:
+        if not user_app:
+             user_api[state] = api_key
+        elif state != list(user_app.keys())[-1]:
              user_api[state] = api_key
         
         return disable_box
@@ -84,17 +86,18 @@ class my_app:
     
 
 def get_response(state, history, query, file):
-        
+        global user_app, user_api
+        print(user_app, user_api, state)
         if not file:
             raise gr.Error(message='Upload a PDF')
-        if state not in user_app:
+        
+        if not user_app or state != list(user_app.keys())[-1]:
              app = my_app()
              user_app[state] = app
         else:
             app = user_app[state]
        
-        app.OPENAI_API_KEY = user_api[state]
-        
+        app.OPENAI_API_KEY = user_api[state]      
         chain = app(file)
 
         result = chain({"question": query, 'chat_history':app.chat_history},return_only_outputs=True)
@@ -106,11 +109,9 @@ def get_response(state, history, query, file):
            yield history,''
 
 def render_file(state,file):
-        if state not in user_app:
-             app = my_app()
-             user_app[state] = app
-        else:
-            app = user_app[state]   
+    
+        app = user_app[state] 
+ 
         doc = fitz.open(file.name)
         page = doc[app.N]
         #Render the page as a PNG image with a resolution of 300 DPI