Hi @jefri.zhang,
From what I know, to test a web app or a mobile app that includes a webview, you’ll need to explicitly switch to the webview in your test. Katalon has a function to do this: https://docs.katalon.com/katalon-studio/docs/mobile-switch-to-web-view.html
Alternatively, you should be able to create a web test in a browser and execute it on a mobile device. There is a thread about this approach here: Testing web apps on mobile devices
Hope this helps,
Chris