diff --git a/src/main.py b/src/main.py
index e2916e5..63938b2 100644
--- a/src/main.py
+++ b/src/main.py
@@ -54,7 +54,7 @@ def load_workbook_with_possible_passwords(filepath, passwords, keep_vba=False, d
 
     raise ValueError(f"None of the provided passwords worked for '{filepath}'")
 
-def copy_excel_file(source_path, destination_path, passwords):
+def copy_excel_file(source_path, destination_path, passwords, original_filename=None):
     logging.info(f"Processing Excel file: {source_path}")
     is_xlsm = source_path.lower().endswith('.xlsm')
     source_wb = load_workbook_with_possible_passwords(
@@ -75,10 +75,11 @@ def copy_excel_file(source_path, destination_path, passwords):
         # Create new sheet in destination workbook
         from openpyxl.chartsheet import Chartsheet
         if isinstance(source_sheet, Chartsheet):
-            original_filename = os.path.basename(source_path)
-            if '_processed' in original_filename:  # If it's a temp file, get original name
-                original_filename = original_filename.split('_processed')[0]
-            chartsheet_warning = f"Chartsheet detected in '{original_filename}' on sheet '{sheet_name}'."
+            # Use original_filename if provided, otherwise use source_path
+            display_filename = original_filename or os.path.basename(source_path)
+            if '_processed' in display_filename:  # If it's a temp file, get original name
+                display_filename = display_filename.split('_processed')[0]
+            chartsheet_warning = f"Chartsheet detected in '{display_filename}' on sheet '{sheet_name}'."
             # For chartsheets, we need to create a worksheet instead
             dest_sheet = dest_wb.create_sheet(title=sheet_name)
             
diff --git a/src/streamlit_app.py b/src/streamlit_app.py
index 2ece62c..cd7ad1e 100644
--- a/src/streamlit_app.py
+++ b/src/streamlit_app.py
@@ -371,7 +371,8 @@ if input_method == "Upload Files" and uploaded_files and st.button("Process File
                 temp_output_path = f"{temp_input_path}_processed"
                 
                 if file_type == "Excel":
-                    chartsheet_warning = copy_excel_file(temp_input_path, temp_output_path, passwords)
+                    # Pass original filename to copy_excel_file
+                    chartsheet_warning = copy_excel_file(temp_input_path, temp_output_path, passwords, original_filename=uploaded_file.name)
                     if chartsheet_warning:
                         st.warning(f"⚠️ {chartsheet_warning} Please check the processed file against the original to ensure data was copied correctly.")
                 else:  # Word