Android
For Android, testing is done through Google's Internal App Sharing.
The development team uploads the app bundle or APK through that service, and the tester downloads it using the specific link generated during the CircleCI workflow.
The tester must be added as an "Authorized Tester". Organize with a mobile developer to get the proper authorization.
Remember to use your Rocket.Chat's email through the authorization process.
Once the tester is properly invited, they will be able to access the link provided by the DEV team to download the app bundle or APK.
Without authorization, Google won't allow them to download the app even If they have the link.
Getting the link and downloading the app
The simplest way to obtain the link to the uploaded AAB to internal App Sharing is through the CircleCI workflow.
Below, there's a common CI workflow that has both iOS and Android Experimental builds ready for testing.
To find and confirm the Android experimental build that the tester needs to install on their device, click on android-internal-app-sharing-experimental.
Once redirected, scroll down to the Fastlane Play Store Upload section and copy the link as shown below.
This link should be opened through the mobile device.
To make it easier and faster, a QR Code generator could be used. Like this one.
Confirming the tester has the right build
On the same CircleCI workflow, click on android-build-experiemental and check the number at the top of the page.
Once Installed, the tester may confirm the version number in a couple of places inside the app, before and after logging in.