\documentclass[a4paper]{article}
\usepackage[paper=A4,pagesize]{typearea}
\usepackage{graphicx}
\usepackage{afterpage}
\usepackage{lipsum}% dummy code
\begin{document}
\lipsum% Placed on A4
\afterpage{% Insert after the current page
\clearpage
\KOMAoptions{paper=A3,pagesize}
\recalctypearea
\begin{figure}[p]
\includegraphics[height=\textheight,width=\textwidth,keepaspectratio]{largeimage}%
\caption{A large image which required A3}
\end{figure}
\clearpage
\KOMAoptions{paper=A4,pagesize}
\recalctypearea
}
\lipsum% Placed on A4 again
\end{document}
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Ivan,
Insere uma página PDF.
Outra coisa: como você fez para que o gmail entendesse esse código como código? Você usou alguma tag?
Laia