Mo. Rev. Stat. § 474.380
Any will admitted to probate in any state, territory or district of the United States, together with the order admitting the same to probate therein, authenticated according to act of congress, shall be admitted to probate in this state in any county where real estate is affected thereby, or filed in the office of the recorder of deeds in such county. All wills so authenticated, admitted to probate in any county, or filed for record in any recorder's office, give notice thereof, and they, or certified copies thereof, shall be admitted as evidence in all courts in this state. When any will is admitted to probate in this state under this section a certified copy thereof, under official seal, made by the judge or clerk, or, in case the same is filed in the office of the recorder of deeds, a copy of the record thereof, and order admitting it to probate, duly authenticated, may be filed in any other county in this state where real estate is thereby affected, with like effect as if originally filed therein.
§ 474.380, RSMo