using Copilot in VSCode to document multiple functions C/C++ in one action

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I am trying to use Copilot in VSCode to generate documentation of a C++ file with many function definitions (not class member functions). It works great to if I select just one function - Copilot generates excellent documentation for that function.

However, if I select , say 10 functions, the /doc command only documents a single function. If I select nothing, I get some summary documentation at the top of the file. This is really a problem, as I have 100's of functions to document and doing them one at a time is very slow. Is there any way to tell Copilot to "document all functions in the current file"