I'm trying to add an AR Reference Image to the ARKit Image detection sample project in Xcode 9.3 beta 2.I drag an image to the AR Resource Image slot, but it's content.json won't include the filename: { images : [ ], info : { version : 1, author : xcode }, properties : { width : 16.875, unit : centimeters }}Adding the filename manually seems to work in the sample project: { images : [ { idiom : universal, filename : LaunchScreen-iPhonePortrait.png } ], info : { version : 1, author : xcode }, properties : { width : 16.875, unit : centimeters }}Edit: This seems to be a bug. It works correctly when you don't create an AR Reference Image slot via the context menu, but directly drag the image to the Resource group.