Create Document actions allow the end user to create a new document based upon a template that is stored in a document library. They also allow the user to upload an existing document from any location, including outside SharePoint.
Another feature is an option that allows the builder to choose to limit the library where documents are created or uploaded, rather than having the end user prompted with a list of available libraries.
Note: Template documents with a non-alphanumeric character as the first character in its filename are not supported. This include underscore characters as well as percent signs.