Hello ConTeXist. Is there any possibility or modifications that will allow to savebuffer to work, so that will add (merge) the buffer contents into a file (Which content of the previous buffer)? For inspiration, it is possible use a solution that wrote before year ago Wolfgang for Lukas Prochazka – ie https://mailman.ntg.nl/pipermail/ntg-context/2016/087657.html Thanx Jaroslav Hajtmar Here is source code of Wolfgangs solution: \unexpanded\def\startcontentexport {\dosingleempty\dostartcontentexport} \def\dostartcontentexport[#1]% {\iffirstargument \edef\contentexportfile{#1}% \else \let\contentexportfile\empty \fi \grabbufferdata[contentexport][startcontentexport][stopcontentexport]} \def\stopcontentexport {\doifsomething{\contentexportfile}{\savebuffer[list=contentexport,prefix=no,file=\contentexportfile]}% \getbufferdata[contentexport]} \starttext A \startcontentexport[Test.mkiv] Basic content … \startitemize \item Item \stopitemize \stopcontentexport B \startcontentexport[Test.mkiv] Add this text into Test.mkiv file \startitemize \item Item \stopitemize \stopcontentexport C \startcontentexport[Test.mkiv] And this text add into Test.mkiv file too. \startitemize \item Item \stopitemize \stopcontentexport \stoptext