This summary is not the rule. The rule text controls.
When there's too much paperwork or too many records for the court to look at directly, a party can use a summary, chart, or calculation instead. This might apply to things like years of business records, phone logs, or financial documents. Rather than making everyone sit and read through thousands of pages, someone can create a simpler version that shows what the records contain.
But there's a catch. Before using this shortcut, the party creating the summary has to let the other side see the actual original documents (or copies of them). This has to happen at a reasonable time and place, so the other party can check that the summary is accurate and fair. This gives everyone a chance to make sure the summary isn't leaving out important details or twisting the facts.
The judge also has the power to step in and order the original documents brought to court, even after a summary has been used. This helps make sure nothing questionable is happening with how the records were summarized. In short, this rule allows for a practical way to handle huge amounts of paperwork while still protecting everyone's right to check the real evidence.