Like cromag, I don't export from LibreOffice to HTML, and I've never had any trouble with flash drives.
I can, however, tell you what "recursively" means: "apply the changes to this directory and everything inside it". If you tick the box, whatever changes you made will be applied to the directory you've selected, and all sub-directories. If you don't tick the box, it will only apply to the directory you've selected.
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