try soundfile

app.py

@@ -880,7 +880,8 @@ def playsound():
             soundfilename = Filename_Chatbot
             print("soundfilename:", soundfilename)
             # return None
-            return gr.update(value = soundfilename)
+            # return gr.update(value = soundfilename)
+            return soundfilename
     except Exception as e:
         print("playsound error:", e)
         return None