Thanks for reaching out hdtv-entertainment. Right now you can utilize Google Drive for document storage, then provide links to the documents in the Resources section of our plugin. That said, I totally agree that more seamless integration would be great. There isn't a timeline for adding document management, but it's easily our most requested feature.
For document creation and project management, we likely wouldn't create those only because there are so many good solutions that already exist. Google Docs is great for creating files, and I'd recommend looking at Asana for project management. Both are fantastic tools.