It is required to create custom APK using build server if you are using Firebase. If you don't want to use Firebase or if you are using it on PC where IP keeps changing, then you can use APK from here.
You can change logo, name, package name, server URL and languages of the Android app by registering on app builder server from here. You will be able to create up to 3 customized APKs for every new version.
If you want to use Firebase, then you have to download the google-services.json as shown in the following video and provide it while building the APK. You must use the same Firebase project you used to get Firebase Service Account JSON.
