Solved
New to STM32CubeIDE. How can I add a new folder containing new .cpp files I have created to the project? I don't see an obvious way to do that in Project > Properties or other obvious places. Thanks, Noji Ratzlaff
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Right click in the project tree to create the folder.
Drag/drop files into that folder or right click to create new ones.
Add a new source folder from project properties -> C/C++ General -> Paths and Symbols -> Source Location.
After that, it will build the source files from within that folder.
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