Read across your library at once: what the papers agree on, where they disagree, what is missing.
You need at least 3 papers. An overview written from fewer would be guesswork, so it refuses rather than pretending.
It reads only the papers YOU have saved — never the wider internet, and never a paper you do not have.
Every statement has a "sources" button showing which of your papers it came from. Anything that cannot be attributed is dropped rather than shown to you.
Where your papers conflict is usually the most useful part of a literature review, so it has its own section.
This proposes what is missing from YOUR set of papers, with a way to check each one.
They are candidates to verify, never findings. A gap named here may already be filled by work you have not found yet — always check before building on it.
Open Review your papers and find gaps in the app (sign-in required).