Update Apple Apple from iOS 5 to 6

Update Apple App to new version, following the steps.

1. Select project to iOS device and edit scheme of archive.
2. Build archive.
3. Go to http://itunesconnect.apple.com to add new version.
4. Edit update note then finish the new version process. Status will show waiting for upload.
5. Xcode --> Select archive to do validate process
6. Xcode --> Distribute archive

You will occurs the missing screen if update to iOS6 and forget to upload 4 inches screenshot.

Just upload the screenshots from your simulator or iOS devices including iPad & iPhone.

Good luck.