Sections and Folders
Folders can be created in the web editor to organize your book or writing project. Not only are folders a handy way to split your project into manageable pieces for editing, they're also used for display.
Folders are represented as "sections" outside the editor. Penflip Help, for example, has the following sections: Getting Started, Writing, and Working Offline. Each of these sections is actually folder containing numerous files.
When a project is downloaded as a PDF, folders become "parts", and are included in the table of contents with chapters nested beneath them.
Within the Penflip editor, folders can be dragged and dropped to reorder. Files can be dragged and dropped between folders.
If you do not want to include a folder in the compiled output (e.g. a notes folder), there is no shortcut for currently doing so. You'll have to manually hide each file within the folder.
Unsupported in the Penflip editor at this time, coming soon!
Currently could be done offline by editing content of the file _title.md in the target folder.
As a precaution, you can only delete empty folders. To delete a folder with contents, first delete or move the contents to another folder.