C++ How can I get a return a reference and save the refence as a local variable in a function?

std::vector<uint8> & getBuffer() const
{
   return m_myBuffer;
}

int someFunction()
{
   std::vector<uint8> myFileBuffer = myFile.getBuffer();
}

// Note the extra const on this line.
std::vector<uint8> const& getBuffer() const
{
    return m_myBuffer;
}

std::vector<uint8> const& myFileBuffer = myFile.getBuffer();

std::vector<uint8>& myFileBuffer = myFile.getBuffer();

std::vector<uint8> myFileBuffer = myFile.getBuffer();