If you’re working in a message window, messages that you receive from that contact are displayed. Otherwise, you'll receive a new message notification based on the Notification via setting.
If the Notification via setting is set to Second screen, the notification will appear briefly on the Second screen that you can tap to open the message or you can open the Notifications panel to view the new notification.
If the Notification via setting is set to Pop-up, you’ll receive a pop-up notification on the current screen which you can use to directly reply.
If the Notification via setting is set to Notification Panel only, the notification will only be displayed in the Notification panel.
If the Auto-retrieve setting isn’t checkmarked, tap Download to view the full message.
If the message contains a media file, tap the Play button to view, watch, or listen to it. Touch and hold the media file to open a context menu with additional options.