The problem
A chat model can sound confident even when it has not seen your document. If you ask about your college rulebook, internship policy, or a startup pitch deck, the model may answer from general patterns instead of your file.
For a document QA app, that is not enough. Your user needs answers that come from the uploaded documents and can be checked.
Key point
One idea
Do not ask the model to remember your documents. Retrieve the relevant parts first, then ask the model to answer only from those parts.