\documentclass{beamer}
\usepackage{tikz}
\usepackage[text=black, background=white, arrow=black]{callouts}
\usetheme{Madrid}
%\title{Vacuum decay and Gravitational waves}
\title{True vacuum first order phase transition}
\subtitle{Transition amplitude calculation for a toy model}
\author{Lourenço Entrudo, Gonçalo Costa }
\institute{CFTC Summer Internships}
\date{28 July 2023}
\begin{document}
\begin{frame}
\titlepage
\end{frame}
\section{The starting point}
\begin{frame}
\begin{figure}
\centering
\begin{annotate}{\includegraphics[scale=0.25]{potencial invertido.png}}{0.25}
%\helpgrid[black]
\note{1,1}{\tiny $\phi_+$}
\end{annotate}
\caption{Caption}
\label{fig:enter-label}
\end{figure}
\end{frame}
\section{Vacuum decay and Toy Potential}
\begin{frame}{Vacuum decay and Toy Potential}
\end{frame}
\end{document}
Im using this code to annotate an image. However, the command \note{1,1}{\tiny $\phi_+$} doesn't place the note where I want it to, placing it at the origin instead.