Thanks, @YorkshireUser for sharing, @Abhi5, kindly go through the settings on your phone or follow the steps below.
1.Update your phone to the latest software version.
2.Uninstall & reinstall the YI/Kami Home App.
3.Restart your phone.
4.Launch the YI/Kami Home App > Settings > Smart Detection Settings > toggle Motion Detection on. If using a battery camera, launch the Y/Kami Home app > Click inside the camera thumbnail > Click Mode > Motion Detection always On.
5.Access the Settings of your mobile phone > Applications > Application Manager > YI/Kami Home App > Notifications > toggle Allow Notifications on.
6.From the Settings of your mobile phone > tap App Permissions > YI/Kami Home App > toggle Permissions on.
7.Go to Settings > tap Battery > tap the toolbar icon on the top right of the page> tap Optimize Battery Usage > All Apps > YI/Kami Home App > toggle Optimization off.
8.Go to Settings > YI/Kami Home App > toggle Background App Refresh on.