iOS: Portal, Pushbullet's file-transfer app, makes it easy to share file between any device over Wi-Fi, but it was only originally available for Android. Today, it's now out on iOS as well.
With Portal, you can transfer files between any device as long as you're on the same Wi-Fi network. This means you can instantly transfer files from Android to iOS, Windows to iOS, or Mac to iOS, and they never touch a third-party server.
Portal (free) [iTunes App Store]