About Internal Pre-Release Builds
Internal pre-release builds are alpha versions intended for testing, debugging and localization validation purposes, not considered ready to be used in production environments.
The latest pre-release versions usually include unreleased items listed as done on the Issues page before the build date of the version (therefore not all changes might be present in the latest internal pre-release):
Internal builds (from app version v3.x) auto-update to newer ones until a proper pre-release or stable release comes by. To keep receiving internal builds even when a stable version was downloaded, enable both Receive pre-relase updates and Receive internal pre-release updates under Settings > Application.
Not all published internal pre-release builds are pushed via auto-update.