'Build' is not displayed in iTunes Connect using Xcode 8

Please check your email inbox. This may be the issue:

Dear developer,

We have discovered one or more issues with your recent delivery for "App Name". To process your delivery, the following issues must be corrected:

• Missing required icon file - The bundle does not contain an app icon for iPad of exactly '76x76' pixels, in .png format for iOS versions >= 7.0.
• Missing required icon file - The bundle does not contain an app icon for iPad of exactly '167x167' pixels, in .png format for iOS versions supporting iPad Pro.
• Missing required icon file - The bundle does not contain an app icon for iPad of exactly '152x152' pixels, in .png format for iOS versions >= 7.0.

Once these issues have been corrected, you can then redeliver the corrected binary.