Is testing within the Expo app sufficient or should I build the binary?

Im testing my app before submitting to the app stores for the first time. While developing I’ve been testing my app through the Expo app. Is it necessary to build the binary and test that, or is testing with the Expo app sufficient?

In my experience it’s super important to test the app binaries. My app behaves slightly different in expo and binary. To the point where some things work in expo client But do not work in a build.

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You have to. There are always some behaviours and problems in the final build.