Importing a Folder
If you have many files (i.e. dozens of files associated with a novel), you can import them all at once with the "Import Folder" command. This will prompt you to choose a folder and it will import all importable documents inside it.

If you have no document open, this command will create a new document with a Section for each file (the Sections will be named with the filenames of the imported files). If you have a document open, the new Sections will be added to the existing document.

Note that the Import Folder command does not support sub-folders; that is, it does not look inside folders inside the folder you choose. It will also simply skip any invalid (unopenable) files it finds.