The {{INCLUDE: (*file path*) }} command will place the specified file in to your document when assembling the PDF. Highland treats the included file as if it was written within the master document. Easily keep chapters or scenes in separate files or quickly reorganize a long document.
If your file is .highland format, Highland will add the included file to the document assets, always keeping them available. (See Assets Sidebar).
Note: Highland will ignore the include command within an included file.
Pro tip: You can add elements before or after included files. A manual page break ( === ) for example. Have fun with it.