I am trying to rotate a figure with the adjustbox statement as mentioned in Rotate picture with caption. How ever I cant force the caption to be above and not below the plot inside this Code. Also I am trying to place the text of the footnotesize below the figure (at the place of the actual caption). Here is a short reproducible example
\documentclass[a4paper,12pt]{scrartcl}
\usepackage[ngerman]{babel}
\usepackage{amsthm}
\usepackage{mathtools}
\usepackage{adjustbox}
\usepackage{float}
\begin{document}
\section{Appendix}
\begin{figure}[H]
\begin{adjustbox}{addcode={\begin{minipage}{\width}}{\caption{Graphische Lösung: Veränderung der Konturlinien
}\end{minipage}},rotate=90}
\includegraphics[width=\paperwidth]{example-image-c}
\label{fig:Lasscases}
\end{adjustbox}
\footnotesize{RSS und $t$ sind die Werte, bei denen die kleinste Konturlinie die Ecke der Raute tangiert *Das Beispiel unterstellt: $\beta=(0.36, -0.1)$.}
\end{figure}
\end{document}


rotatingpackage. You can take a look at my answer here to see how a table is rotated, and then decide whether to use therotatingpackage or not. – Ruixi Zhang Aug 15 '18 at 23:36