Is this a bug report?

Yes

Have you read the Contributing Guidelines?

Yes

Environment

Environment:
OS: macOS Sierra 10.12.6
Node: 6.11.3
Yarn: 1.0.2
npm: 5.3.0
Watchman: 4.9.0
Xcode: Xcode 8.3.3 Build version 8E3004b
Android Studio: Not Found

Packages: (wanted => installed)
react: 16.0.0-alpha.12 => 16.0.0-alpha.12
react-native: 0.48.4 => 0.48.4

Target Platform: iOS (10.2.1)

Steps to Reproduce

1. Create a new project
2. Use CameraRoll.getPhotos({first: 20,assetType: 'All'}) to retrieve camera roll items, ensure it works properly
3. After selecting an item, try saving a new copy to camera roll using CameraRoll.saveToCameraRoll(item)

Expected Behavior

Photo selected from camera roll would be saved as a new image in camera roll.

Video selected from camera roll would be saved as a new video in camera roll.

Actual Behavior

Videos are saved as a static photo. If 'video' type is passed to CameraRoll.saveToCameraRoll(item, type) then the video does not get saved at all. The video I'm trying to save is a .MOV file (assets-library://asset/asset.mov?id=A9479A56-998A-4E4D-92BC-97A9F60E3930&ext=mov)

Photos are saved properly as static images.

Reproducible Demo

I created an Expo Snack: https://snack.expo.io/ryJvCtFoW

The above will grab the latest video from your device and attempt to save it to camera roll. It alerts the original URI as well as the newly generated URI to show that a .MOV will be saved as a .JPG.