答案1
只需添加\usepackage[bottom]{footmisc}
。
\documentclass{article}
\usepackage[paperheight=5in,paperwidth=3in]{geometry}
%smaller dimensions for testing purposes
\usepackage[bottom]{footmisc}
\usepackage{graphicx}
\begin{document}
test\footnote{test}
\begin{figure}[b]
\centering
\includegraphics[width=0.3\textwidth]{8251.png}%or whatever image you like
\end{figure}
\end{document}