Update app.py

app.py

@@ -106,6 +106,9 @@ def download_button(object_to_download, download_filename, button_text, file_ext
 
 file_upload = st.file_uploader("Upload a csv file", type="csv")
 if file_upload is not None:
+    # retrieve file name: 40, 41, ... 60
+    file_name = file_upload.name
+    st.write(file_name)
     data = pd.read_csv(file_upload)
     #column = data["S11"].iloc[1:].values
     column = data["S11"].values