Update appStore/multiapp.py

appStore/multiapp.py

@@ -45,6 +45,9 @@ class MultiApp:
         })
 
     def run(self):
+        if 'file' not in st.session_state:
+            st.session_state['file'] = None
+    
         st.sidebar.write(format_func=lambda app: app['title'])
         image = Image.open('appStore/img/sdsn.png')
         st.sidebar.image(image)