If you have already uploaded a binary and have rejected it and wish to upload to the same version number:

Go to your plist file and change “CFBundleVersion” so if you’re uploading version 1.2 change it to 1.2.1 but keep the “CFBundleShortVersionString” as 1.2 so you should have

CFBundleShortVersionString – 1.2 CFBundleVersion – 1.2.1

Archive and submit, then in iTunes Connect you will see all the builds you have submitted for the version 1.2