Saved html files missing accompanying folders

In the past when I saved a web page article, there is an accompanying folder which contains formatting and other whatnots the webpage author intended the viewer to see.

Since a week ago, no folder is ever saved with the html file. When I click on the file offline, it is "formatted" text only with no organized structure.

I use PaleMoonx64, a Firefox variant. Waterfox, which I hadn't used in a while, had the same result. Is there a simple answer? Like html5? I haven't tried the latest Firefox(x32) yet. If Opera, Chrome and IE do save container folders, I may have to consider alternative strategies.

Just putting the question to "paper" led me to the answer. I had "advertently" selected a different option, all files, in the "save as" dialogue box for a one-time difficult save. Forgotten and overlooked.