This summary is not the rule. The rule text controls.
This section of the Idaho Appellate Rules is currently marked as "reserved." That means there's no rule here right now. It's just a placeholder, and the number is set aside for possible use later if the court decides to add a new rule in the future.
If you're looking for guidance on appellate procedure, you'll want to check a different rule number, since this one doesn't contain any actual requirements or instructions.