I have merged three external pdf files. Now I want to create table of contents of this resultant pdf file. Here \tablesofcontentsis not working.
\documentclass{article}
\usepackage{pdfpages}
\begin{document}
\includepdf[pages={1,2,3-30}]{myfile1.pdf}
\includepdf[pages={1,2,7-40}]{myfile2.pdf}
\includepdf[pages={990}]{myfile3.pdf}
\end{document}

addtotoc={<page number>,<section>,<level>,<heading>,<label>}in the optional argument of\includepdf. – Gonzalo Medina Mar 22 at 17:41