Frozen where it's locked, fresh where it isn't
With your entries file loaded, the late-swap step shows live game status and your entries. Re-optimize the open spots: players in games that have already started stay where they are, and the rest are re-picked using fresh news and your locks and exclusions.
Cash, GPP or projected points
Each contest keeps its own settings (field size, payout type) and strategy. Cash favors lineups most likely to cash, GPP the highest simulated payout, and Projected points simply the highest projection.
Questions
What is late swap in NBA DFS?
Changing players in a lineup after the contest has started, but only players whose own games haven't tipped yet.
Will late swap change players who already started?
No. Players whose games have started stay frozen in their slots. Only the open spots are re-optimized.
Do I need to upload a new file?
Yes. Save the new entry file and upload it to your DFS site the same way as before.