Unreal Engine 4.18 Preview

[=“dragoongame, post:52, topic:100191”]

I create a default third-person mobile project with 4.18, and it crashs (and no icon) when launching on iOS11 iPad; but the 4.17 default third-person mobile project works just fine on iOS11 iPad. Can anyone tell me how to resolve this? Thanks a lot.
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Should I use Xcode 9 instead of Xcode 9 beta 3? Or should I upgrade macOS from Sierra 10.12.6 to High Sierra 10.13 GM candidate?