On a Mac with two separate macOS user accounts, Account A has a daily-use app in its private ~/Applications folder. I want to install a TestFlight build with the same bundle ID from Account B. Can TestFlight detect, replace, or update the app in Account A’s private folder? Can the installation destination be selected? I also want to understand whether installing or launching the build under Account B can affect Account A’s app container or Application Support data. What Apple-supported setup would you recommend for testing the TestFlight build while protecting Account A’s app and data? Would a separate Mac or separate macOS installation be appropriate?