\documentclass[12pt,aspectratio=1610]{beamer}
\usepackage{adjustbox}
\usepackage{animate}
\begin{document}
\section{Section 1}
\begin{frame}[t]{Frame Title}
\begin{columns}[t]
\begin{column}{0.5\textwidth}
\pause
\adjincludegraphics[width=\linewidth,valign=t,center]{example-image-a}
\pause
\[
foo
\]
\end{column}
\begin{column}{0.5\textwidth}
\begin{onlyenv}<4->
\pause