Do i need to add my driver folder when creating a HLK package? If so, why is it optional?

After the HLK test has finished and i want to create the HLK package, there is an option to give a driver folder.

Microsoft says that this is optional:

https://docs.microsoft.com/en-us/windows-hardware/test/hlk/getstarted/step-8-create-a-submission-package

So do i need to give the folder of my driver that i was testing (which contains the inf,cat,sys files) to the tool? If so, then why does Microsoft says its optional?

And their explanation is very confusing, they say “If you used a special driver for a device (optional)”… what does that even mean? If this is a software WDM driver, should i just create the package without giving it the folder? Will my actual driver that i was testing be in this hlkx file?