This is my first time submitting an app to the App Store. I uploaded a build through Xcode a few days ago, but no build is visible in my app record on App Store Connect (nor are any builds listed in the TestFlight tab). I haven't submitted the app for review yet, because I assumed it needs a build attached first. Did I miss a step in uploading the build?
First experience with App Store Connect
Did I miss a step in uploading the build?
Unless you explain what a thing that you so-call 'build' is and where and how you uploaded it, nobody can really give you a definite answer.
When you have one or more binaries for submission, the + button will become visible under the Build section. If you click on it, you will see a list of candidates. If you don't see the plus button or a list of candidates, something must have gone wrong. You can upload another binary with a different build number. Usually, if there is something wrong with the binary you sending, Organizer will show an error.