Update app.py

app.py

@@ -297,10 +297,10 @@ with tab3:
 with tab4:
     st.write("Upload an Editing Frequency CSV or enter manually:")
     st.write("**Note:** Please upload CSV files **without column headers**, in ascending order from 3244 to 4882.")
-    ef_file = st.file_uploader("Upload EF CSV", type=["csv"], key="ef")
+    ef_file_2 = st.file_uploader("Upload EF CSV", type=["csv"], key="ef2")
 
-    if ef_file:
-        ef_df = pd.read_csv(ef_file, header=None)
+    if ef_file_2:
+        ef_df = pd.read_csv(ef_file_2, header=None)
         ef_df.columns = [str(site) for site in sorted(mutation_site_headers_actual_3614)]
     else:
         ef_df = pd.DataFrame(columns=[str(site) for site in sorted(mutation_site_headers_actual_3614)])