New iTunes connect interface error “You must choose a build”

Question

When trying to submit my new app to the app store, I noticed Apple has changed its website interface: after updating metadata and keywords and hitting \"submit for review\" I go

Answer 1

The chances are you just need to wait for the new build to pass the 'Validation' process. If you go to the new 'prerelease' tab in itunes connect, you can see the status of your new build. Wait until it's ready, and then go back to Versions tab and the + sign will be available next to the Builds section.