This summary is not the rule. The rule text controls.
When there are too many documents, recordings, or photos to easily go through in court, a party can use a chart, summary, or calculation to show what they contain instead. This makes it easier for everyone, including the judge and jury, to understand large amounts of information without sitting through hours of reviewing every single page or file.
But there's a catch. Before using a summary like this, the party must let the other side look at the original documents or copies of them. This has to happen at a reasonable time and place, so the other side can check that the summary is accurate and fair. The judge can also order that the actual original documents be brought to court if needed.
This rule exists to save time while still keeping things honest. It stops one side from creating a misleading summary and hiding the real documents from the other party.