Recently I found that the iOS devices cannot download apps from Apps Portal
I download the public application (that can find in App Store) from Apps Portal into the iOS device and it is work.
When I download the internal application (that cannot find in App Store) from Apps Portal into the iOS device and it showed ' Unable to download. XXXXX could not be download at this time.' .
Although the app icon is appeared on the screen, but it displayed black color and nothing happen after I clicked it.