Update app.py

app.py

@@ -107,4 +107,5 @@ if uploaded_file is not None:
 
     output_path = "output.pptx"
     prs.save(output_path)
-    st.download_button("Télécharger la présentation", output_path, key="download_pptx")
+    st.download_button("Télécharger la présentation", output_path, key="download_pptx", mime="application/vnd.openxmlformats-officedocument.presentationml.presentation")
+