Attach Supp To Main Paper

A Step-by-Step Tutorial for LaTeX with Overleaf.

Steps

Place before title of main.tex.

\documentclass{article}
\usepackage{...}

%%====================================%%
\usepackage{pdfpages} % include pdfs
\usepackage{pgffor} % for loops

% Fix for a pdfpages rotation bug with revtex
\makeatletter
\AtBeginDocument{\let\LS@rot\@undefined}
\makeatother

% the name of the supplement PDF file
\def\supplementfilename{supp.pdf}

% Determine the number of pages of Supp
\pdfximage{\supplementfilename}
\def\numbersupplementpages{\the\pdflastximagepages}

\newif\ifarXiv
\arXivtrue 
%%====================================%%

\title{...}
\begin{document}

Place at the end of the document

\ifarXiv
    \foreach \x in {1,...,\numbersupplementpages}
    {
        \includepdf[fitpaper=true, pages=\x]{\supplementfilename}
    }
\fi

\end{document}

Usage

1. Generate supp.pdf and Upload to Overleaf Project.
2. Check main.tex compiles as expected.
3. Click Submit -> Arxiv in Overleaf.
4. Decompress the .tar file and remove supp.tex.
5. Submit to Arxiv