I have various groups for test flight: 1) Internal Testers 2) Employees 3) Beta Testers
We first distribute to all devs via Internal Testers, once we believe it is stable enough, we release to the entire company for further testing and notes, which is Employees, and finally we release to all of our Beta Testers.
It would be very nice however, to be able to alternate between versions, e.g. say the latest version 7, which is for Internal Testers, fixed a lot of bugs, e.g. validations, but unknowingly, version 6 is broken for Employees and Beta Testers. Is it possible, if you are part of the Internal Testers that are testing version 7, to revert/test version 6 and see if these changes had any breaking changes?
Yes, in the TestFlight App, tap on the app icon and then select "Previous Builds".
You will then see a list of previous versions that you have been given access to test. Select the relevant version and then select "install" next to the build of that version that you wish to install.
If you have a known "bad build" you can expire it from the TestFlight page in AppStoreConnect to prevent it from being re-installed.