This summary is not the rule. The rule text controls.
If a judge refuses to let you out on bail while you're appealing your case, or sets the bail amount so high that you can't reasonably pay it, you have the right to challenge that decision. You can do this by filing what's called a habeas corpus proceeding with the appellate court, which is a higher court that reviews decisions made by trial courts.
This means you're not stuck with the trial judge's decision on bail. You can ask the appellate court to look at the reasons the judge gave for denying bail or setting it so high, and the appellate court can decide if that decision was fair or not.
If the appellate court isn't currently in session when you need this review, you don't have to wait. The rule allows you to bring your case to a single judge from that same appellate court instead. This way, you don't lose valuable time waiting for the full court to reconvene, and you can get a quicker answer about your bail situation.