Update app.py

app.py

@@ -161,14 +161,30 @@ def _download_buttons(results: Dict[str, Any], df: pd.DataFrame):
     # PDF
     with c3:
         try:
-            pdf_obj = generate_pdf_report(results)  # may return bytes or a file path
+            pdf_obj = generate_pdf_report(results)
+
+            # Accept bytes, BytesIO/file-like, or path
+            pdf_bytes = None
             if isinstance(pdf_obj, (bytes, bytearray)):
                 pdf_bytes = pdf_obj
+            elif hasattr(pdf_obj, "read"):  # file-like object
+                try:
+                    pdf_bytes = pdf_obj.read()
+                    if not pdf_bytes and hasattr(pdf_obj, "getvalue"):
+                        pdf_bytes = pdf_obj.getvalue()
+                finally:
+                    try:
+                        pdf_obj.close()
+                    except Exception:
+                        pass
             else:
-                # Assume it's a file path
+                # Assume file path
                 with open(pdf_obj, "rb") as f:
                     pdf_bytes = f.read()
 
+            if not pdf_bytes:
+                raise ValueError("Empty PDF bytes")
+
             st.download_button(
                 "Download PDF",
                 data=pdf_bytes,
@@ -181,6 +197,7 @@ def _download_buttons(results: Dict[str, Any], df: pd.DataFrame):
             logger.exception(f"PDF generation failed: {e}")
 
 
+
 def _render_audio(audio_files: Dict[str, Any]):
     if not audio_files:
         return