Hi, I believe I have the same issue as mentioned above.
The project structure in my solution does not necessarily represent the physical project structure. If i want to include an existing folder with its files in the solution, I have to first create a virtual source folder representing the physical one and then add the files to it. It is not possible to add an existing folder with its files without this workaround. In case of adding e.g. a new library, the whole library structure has to be recreated manually.
The expected behavior would be that whenever a new folder is added to the physical project structure, it also appears in the solution.