Idaho R. App. P. 21
The failure to physically file a notice of appeal or notice of cross-appeal with the clerk of the district court or an administrative agency, or the failure to physically file a petition for rehearing or a challenge to a final redistricting plan with the clerk of the Supreme Court, each within the time limits prescribed by these rules, shall be jurisdictional and shall cause automatic dismissal of such appeal or petition, upon the motion of any party, or upon the initiative of the Supreme Court. Failure of a party to timely take any other step in the appellate process shall not be deemed jurisdictional, but may be grounds only for such action or sanction as the Supreme Court deems appropriate, which may include dismissal of the appeal.
Id. App. R. 21