I use folders for story-structure and chapter heading ‘documents’ for chapters, neither of which export with ‘Numbered export files’ pre-fixes.
How can a beta-reader know the chapter order if their file-explorer sorts alphabetically and there’s no chapter-number clue from numbered-exports? They’d have to visit every non-numbered directory in search of the next numbered scene document. Better to just tell them what order to visit folders.
Ideally, the document numbering applies per document nesting level or numbering is flattened (i.e. 1 Intro Chapter \ 2 Scene1.1, 3 Scene1.2, 4 Scene 1.3,. .\5 Next Chapter, 6 Scene 1 …).