How to add subdirectories to the Files folder?

I hope I'm understanding this correctly Thomas.

It sounds like you have a Project to complete which involves the creation of a large document. Within this project, you have one 'main' item where the large document will be created and finalized. The large document is made up of various contributions and different work. If this is the case, it sounds like you need to focus your effort around the Project layout to achieve it.

Perhaps try this:

• Create a Folder in your Folder tree.
• Within this Folder, create a Project - this is where the large document will be created and finalized.
• Add the user/project participants as Tasks within this Project and assignee the particpants to each task they need to work on.
• When all the tasks have been completed, it means it means the large document that sits at Project level is now ready to be finalized.

Let me know if I've misunderstood what you're looking to achieve and I'm happy to discuss further 🙂