Why can't I upload files from my iPhone?

Episode 1132 (58:51)

Jackson from Monrovia, CA
iPhone 6 and iPhone 6 Plus

Jackson is having trouble uploading his documents onto his school network via his iPhone and iPad. It will only let him upload photos. Leo says that's by design. On iPhone and iPad, he can only access files from the program that created them. So it won't let him upload anything from anywhere, only in the app he's using. This helps keep iOS secure.