Update app.py

app.py

@@ -237,11 +237,9 @@ def generate_pdf_report(original_img: Image.Image, mask: np.ndarray, overlay: Im
         pdf.set_font("helvetica", "I", 10)
         pdf.cell(text="This report was generated by DR Analysis System", new_x="LMARGIN", new_y="NEXT", align='C')
         
-        # Get PDF as bytes - the critical fix
-        pdf_output = pdf.output()
-        if isinstance(pdf_output, str):
-            return pdf_output.encode('latin1')
-        return pdf_output
+        # Get PDF as bytes
+        pdf_bytes = pdf.output(dest='S').encode('latin1')
+        return pdf_bytes
     
     except Exception as e:
         st.error(f"PDF generation failed: {str(e)}")