How to debug engine source code on iPhone?

below is what i do:

create a c++ project on windows, correctly set a remote mac for compile job (rsync way)

set the "Buid Configuration" to "DebugGame", check "Include Debug Files"

start deploy

100460-debugging2.png

the project is successfully deployed to my iphone

start the game, and connect the device to the remote mac

open the generated xcode project file "UE4_FromPC.xcodeproj", choose Debug->Attach to Process->the game we previously launched

the game is successfully attached, i set breakpoint at the source code, the game stops as desired.

below is the "UE4_FromPC.xcodeproj":

Here comes my questions:

1. The engine module is not included in the project, how can i debug the engine source?

2. see the pic below, what amaze me is that if i pause the game, i can jump to engine code, and then i can set break point ! So i wonder if there is a way to include engine source in the generated "UE4_FromPC.xcodeproj"