Ohio Rev. Code Ann. § 1747.04

A trust instrument may be amended in the manner specified in it or in any manner that is valid under the common or statutory law applicable to the trust created under it. However, no amendment adopted subsequent to the initial filings required by section 1747.03 of the Revised Code is legally effective in this state until an executed or certified true and correct copy of the amendment has been filed in the office of the secretary of state accompanied by the fee specified in division (T) of section 111.16 of the Revised Code.