This summary is not the rule. The rule text controls.
When a case involves huge amounts of documents, recordings, or photos that would be too hard to review piece by piece in court, someone can create a chart, summary, or calculation to show what all that material contains. This lets a witness or attorney present the key information in a simple, organized way instead of forcing the judge and jury to sit through every single page or file.
But there's a catch. The person using the summary has to let the other side look at or copy the original materials first. This has to happen at a reasonable time and place, so the other side can check that the summary is accurate and fair. If needed, the judge can also order that the original documents or recordings be brought into court.
This rule exists so trials can move efficiently when dealing with large amounts of records, like years of financial statements or hundreds of phone logs. At the same time, it protects both sides by making sure no one can hide behind a summary or twist the facts. The other party always has the right to check the real evidence behind the summary.