i got \include{FrontBackMatter/Bibliography} in my main.tex file
and in the Bibliography.tex it got
\label{app:bibliography} % Reference the bibliography elsewhere with \autoref{app:bibliography}
\manualmark % Work-around to have small caps also here in the headline
\markboth{\spacedlowsmallcaps{\bibname}}{\spacedlowsmallcaps{\bibname}} % Work-around to have small caps also
%\phantomsection
\refstepcounter{dummy}
\addtocontents{toc}{\protect\vspace{\beforebibskip}} % Place the bibliography slightly below the rest of the document content in the table of contents
\addcontentsline{toc}{chapter}{\tocEntry{\bibname}}
\printbibliography
this but i can't add the reference to my main.pdf or it's being printed
\printbibliography), you will have to run Biber on your file, so that the compilation sequence becomes LaTeX, Biber, LaTeX, LaTeX (where "LaTeX" is your favourite LaTeX flavour: pdfLaTeX, LuaLaTeX, XeLaTeX, ...). See https://tex.stackexchange.com/q/63852/35864 for background explanations and https://tex.stackexchange.com/q/154751/35864 for help on getting your editor to run Biber for you. – moewe May 03 '20 at 08:43