Buffer app for iOS 8 got a feature that lets you send an image from the new iOS 8 Share Menu to their app. The flow is like this:
- Open iOS Photos app
- Select an image and tap the share icon
- Select Buffer from the menu (you may need to enable it first)
- Buffer app opens and the image is automatically attached in the composer window
How did they manage the part to invoke their full app without using a small widget like most of the other apps do?