Ohio Rev. Code § 4903.21: Transcript.

Upon service or waiver of the notice of appeal as provided in section 4903.13 of the Revised Code, the public utilities commission shall forthwith transmit to the clerk of the supreme court a transcript of the journal entries, the original papers or transcripts thereof, and a certified transcript of all evidence adduced upon the hearing before the commission in the proceeding complained of, which documents shall be filed in said court.