Ideas in fragments
Brief the half-formed thought before it becomes another lost note.
Content creators
Dossier keeps ideas, audience notes, sponsor promises, collaborator context, and the reasons behind a piece so you can ask for them later.

Use it for
Brief the half-formed thought before it becomes another lost note.
Keep what they asked for, what you promised, and what not to repeat.
Save the comments, questions, and recurring objections worth coming back to.
Fit
FAQ
No. It helps you remember the context you want to write from.
Yes, if you brief them. Dossier keeps the promise and the person attached.
Brief it in your own words and come back when you are ready.