I can assure you that plenty of people who were using computers before smartphones, and who have used them every day at work for decades, also do not grasp what we could consider the very basics of file management.
I think.. the way to understand it is: levels. After all, files as the abstractions work with are not exactly there in the form of files in a cabinet. In a sense, even names are made made up fiction, BUT.. a helpful one.
