This is sort of two related questions:
Only send new build to subset of external testers
I have a prerelease version of an app in TestFlight which has been sent to a few hundred external testers. I'd like to send a new build (same version) of the app to "Submit For Beta App Review", and when that is approved only send the updated build out to a subset of external testers. Is that possible?Force update to new build for external testers
Eventually, I'd like to force my external testers to update to the newest version of the app and not allow them to use the previous build. Is this possible?
