[[qanda:topic_unsolved]] How do I update header file with .ui update?

How do I update the header file after saving the .ui file?

I've disabled shadow copying, and can see that it generated a ui_projectname.h file but it does not change the main header file.

What I am trying to do is import a .ui from a PyQt5 project that I've made, and want to convert to C++. I am unable to access any members such as lineEdit->setText("Hello World"); in the main.cpp after Widget w;

Any help with this would be unfathomably wonderful.