Hi as far as i know the document template, to create a document is only available in studio pro: https://docs.mendix.com/refguide/document-templates#1-introduction

You can however manage documents by uploading an downloading with studio: https://docs.mendix.com/studio-how-to/pages-how-to-attach-files#4-adding-a-file-manager

You can try this module from the app store that lets you generate documents from standard Mendix pages https://appstore.home.mendix.com/link/app/114043/ 
It works fine in studio.