And is it possobile to build Android app in shipping mode without Play Market?
I set “For Distribution” flag and keystore in “Distribution Signing”, but accoring to log of the app installed from apk, it still works in development mode.
Yes, you can build and install an Unreal Engine Android APK in Shipping mode without publishing it to Google Play. Make sure the build configuration is set to Shipping and that you’re not using a Development build or Development signing configuration. The APK can then be installed directly for testing, provided Android allows installation from your chosen source.