Advice about Shared Folders - newby question

I’m brand new to NAS but following the SPACEREX video tutorial (thank you) set up my Synology DS218j at the first attempt.

On my home network in Win 10, I can see the Shared folder I set up, called house.

I was trying to replicate my desktop HDD file system, so I can backup files to the NAS and write new ones to it, but here I am confused.

I can copy individual files to the shared folder, but not directories, eg “My Docs” where I have a folder for each month and then sub folders for different file types, eg “pdf”

Is it possible to replicate the directory and folder structure I am used to ? Or do I need to Control Panel to set up new individual shared folders for everythinbg?

Thank you for reading my question…