By default, all installed apps are updated automatically, but you can adjust the setting by following these steps:
1. Make sure your device is connected to the Internet through mobile data or Wi-Fi.
2. Open the KaiStore.
3. Choose “Options” > “Settings” > “Auto Update”. From there, you are able to pick whether apps should be updated via Wi-Fi, mobile data, both or not at all.
To find out more about app collection on KaiStore, please check this article.