fix: download button

app.py

@@ -69,6 +69,7 @@ with col2:
                 df_right = st.session_state.df.copy(deep=True)
                 df_right.pupil_dilation = df_right.pupil_dilation.map(lambda ser: [f for f in ser if f != 0.0])
                 df_right.baseline = df_right.baseline.map(lambda ser: [f for f in ser if f != 0.0])
+                st.session_state['df'] = df_right.copy(deep=True)
                 st.success("Blinking values have been removed!")
         elif detect_blinking and not number_of_blinks:
             st.caption("No blinking values were found in your data!")
@@ -86,8 +87,7 @@ with col2:
                 df_right[relative_key] = [[field_value - baseline_mean[i] for field_value in df_right[option[0]][i]] for i in range(len(df_right))]
                 st.markdown("After adding calculated fields")
                 st.dataframe(df_right)
-                with open('myfile.csv') as f:
-                    st.download_button('Download CSV', f)
+                st.download_button('Download CSV', df_right.to_csv("myfile.csv"))
                 st.info("Your data has been downloaded, you can visualize and detect outliers in the 'Plotting' and 'Detect Outliers' pages on the sidebar.")
 
 if not df_base.empty: