Does the Xiaomi Watch S3 support receiving message notifications from mobile phones?

It supports receiving mobile phone messages. After turning on the message notification switch on the Mi Fitness APP, while the watch and mobile phone remain connected, you can synchronize the message notifications on the mobile phone on the watch. The watch only supports viewing messages and does not support replies.
You can set it by the following path:
Open the [Mi Fitness] APP >> [Device] >> [App notifications] >> turn on the [App notifications] option. You can also select [Sync all notifications] or [Custom notifications] as your preference on this page.