When using Pilot to upload the build I'm setting skip_submission: true but the build is still distributed to internal testers. I was under the impression that only the IPA would be uploaded and it wouldn't go to testing?
pilot(
changelog: "Live",
skip_submission: true
)
Your impression is correct, see the discussion at https://github.com/fastlane/fastlane/issues/1888
iTunes connect will automatically distribute any new build to internal testers if testing is enabled for that particular version / build train. Skip submission only prevents fastlane from sending the build for external testing review.