livesession recorded file serlaizer enhanced to show the cause of 400 badrequest errors in a more spicific way

apps/course/views/live_session.py

@@ -654,7 +654,9 @@ class CourseLiveSessionRecordedFileAPIView(GenericAPIView):
         logger.info(f"[LiveSession Recorded File] Latest session found - session_id={session.id} course_id={course_id}")
         
         serializer = self.get_serializer(data=request.data)
-        serializer.is_valid(raise_exception=True)
+        if not serializer.is_valid():
+            logger.error(f"[LiveSession Recorded File] Validation errors: {serializer.errors}")
+            raise AppAPIException(serializer.errors, status_code=status.HTTP_400_BAD_REQUEST)
 
         recording = LiveSessionRecording.objects.create(
             session=session,