VR Cardboard on IOS - video not supported? Unity 2017.3 GVR1.12

Trying to run the default video demo in GVR1.12 on Cardboard for iOS, and everything works great except the video libraries don’t seem to load. The in-app error is “Video Support libraries not found or could not be loaded! Please add the GVRVideoPlayer.unitypackage to this project.

I definitely imported the package (it shows up in the Assets folder after installing GVR), but still no luck.

Any help is greatly appreciated.

Sadly no support for iOS (search “video iOS” in the bug area of GitHub).