Rule 8.10 - WITHDRAWAL, SUBSTITUTION, AND ASSOCIATION OF ATTORNEYS ON APPEAL(1) During the pendency of an appeal, an attorney may not withdraw from or substitute new counsel in a case except on order of the appellate court. A motion to withdraw or substitute new counsel must be filed and served on the client and every other party to the appeal, and is subject to ORS 9.380(1)(b) and ORS 9.390.(2) Except as provided in ORAP 8.12, unless it appears otherwise from the record, the court will presume that good and sufficient cause exists for substitution of counsel if both attorneys sign the motion for substitution of counsel. On filing of the motion for substitution of counsel in proper form and bearing the signatures of both attorneys, the substitution shall be deemed to have been ordered by the appellate court.(3) An attorney who associates another attorney from a different firm on appeal shall file a notice of association with the appellate court, accompanied by proof of service on every other party to the appeal.(4) An attorney admitted to the practice of law in another jurisdiction, but not in Oregon, may appear by brief and argue the cause in a proceeding before an appellate court in the manner prescribed in UTCR 3.170.