Courts at the appellate level review the findings and evidence from the lower court and determine if there is sufficient evidence to support the determination made by the lower court. Also, the appellate court will determine if the trial or lower court correctly applied the law. The highest form of an appellate court in the U.S. is the U.S. Supreme Court, which hears only appeals of major importance and consequence.
I think there are grounds for both functions to be appealed.