Update app.py

app.py

@@ -26,7 +26,7 @@ with st.form("form", clear_on_submit=True):
     uploaded_file = st.file_uploader("Upload image files", type="jpg", accept_multiple_files=True)
     submitted = st.form_submit_button("UPLOAD!")
     
-    if submitted and file is not None:
+    if submitted and uploaded_file is not None:
         st.write("UPLOADED!")
         st.image(uploaded_file, width=100)