Add folders to notebooks

Looks strangely like someone else had a discussion about this two years earlier...
Anyway I would like to be able to add folders inside each notebook to better organize notes at a glance.

To clarify under each open notebook, wherein you would see the notes' titles, I would like the ability to place a folder here and move the notes into them.

So lets say I'm keeping notes on chapters of a book.
I might say create "Chapter 5 Notes" as a folder, and relocate all the chapter 5 notes underneath it.

Obviously the ability to expand/collapse the folder would be necessary as well.

Can you expand on what do you mean?

Just a note that you can add notebooks inside notebooks

Additionally you can use hotfolder plugin to upload files to Joplin automatically

Hope this helps