Can I test app update for Android and iOS apps on BrowserStack?

Yes, you can test app update for both Android & iOS apps. Use the following steps for reference:

iOS: Install current version from App Store. Then, install higher version from TestFlight to trigger app update.

Android: Install current version from Play Store. Then, upload and install higher version during the session to trigger app update. Make sure that higher version is signed with the same certificate as the Play Store App.