I am assuming that you have included all details correctly in the app while using Buildbox. before export, I need to check that. Also, I need the certificate to use the distribution provisioning profile and the Apple Developer Distribution Certificate need to add to my system Keychain, compile the game, and then submit to Apple – which can all be done from within Xcode itself.
-Export from Buildbox
-Open Xcode
-Open the project in Xcode
-Select the account you will be using to upload the game
-Authentication of Version, Build and Deployment Target
-Click the Product menu, select Archive and put it in Xcode’s Organiser, with the just-built app selected
-Provided that the game has been set up in iTunes Connect, you can now upload and validate the app. To Validate, press [Validate] and follow the prompts.
-To submit the game, press [Submit] and follow the easy to follow prompts. Note that submitting will also do a validate, so the previous step is not strictly required.
-Then, you can check the full App Information & Metadata from iTunes connect