I am using `sidewaysfigure` environment to rotate my figures. However, they are not centered in the middle of the page. I can't use `\centering` since I want that my footnote is "left aligned".

Here is a short example:

```
\documentclass[a4paper,12pt]{scrartcl}
\usepackage[ngerman]{babel}
\usepackage{amsthm}
\usepackage{mathtools}

\usepackage{rotating}
 \usepackage{float}

\begin{document}
\begin{sidewaysfigure}
\caption{Fill}
 \includegraphics[width=0.9\paperwidth]{example-image-c}
 \footnotesize 

 A long footnote
  \label{fig:fill}
\end{sidewaysfigure}
\end{document}

```

The output of my "real example" with the code mentioned in the comments:

[![enter image description here](https://i.stack.imgur.com/XmCNf.png)](https://i.stack.imgur.com/XmCNf.png)

The caption should be aligned in the same height as the footnote.