I don't know if you found a solution yet but i just ran into this issue doing an update to an older app. The builds would not show up in itunesconnect. It seemed to resolve itself when I added a few new things to the plist based on the app features...
<key>NSAppleMusicUsageDescription</key>
<string>music playback</string>
<key>NSCalendarsUsageDescription</key>
<string>events</string>
<key>NSCameraUsageDescription</key>
<string>overlay feature</string>
<key>NSLocationWhenInUseUsageDescription</key>
<string>Store Locator</string>
<key>NSPhotoLibraryUsageDescription</key>
<string>Saving selected wallpaper</string>
... and this one...
<key>ITSAppUsesNonExemptEncryption</key>
<false/>