Does the state and defense have to present all their evidence at the pretrial hearings, or can they hold it back until trial? Please don't speculate, correct answers only.

Does the state and defense have to present all their evidence at the pretrial hearings, or can they hold it back until trial?

I was under the impression that it all had to be revealed ahead of trial. Others here, seem to think that they can present items for the first time during the trial.