How to add Editor symbols for debugging on Github source engine.

Development Programming & Scripting C++
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How I fixed it :

  1. Removed my sources entirely to make it a blueprint project.
  2. Opened the project
  3. Created a new class to make it C++ again, then closed the editor.
  4. Right-clicked the .project file and generated the visual project.

Now, I can add whatever I want back. If I build the project and use it, when it crashes, I have the history.