begin{frame}{Title of frame}
    begin{minipage}[t][0.45textheight][t]{0.45textwidth}
%       begin{figure}
%           includegraphics[width=textwidth]{Figure_left_top.pdf}
%       end{figure}
        footnotetext{Figure left top}
    end{minipage}
    %pause
    begin{minipage}[t][0.9textheight][t]{0.45textwidth}
%       begin{figure}
%           includegraphics[width=textwidth]{Figure_right.pdf}
%       end{figure}
        footnotetext{Figure right}
    end{minipage}
    %pause
    begin{minipage}[t][0.45textheight][t]{0.45textwidth}
%       begin{figure}
%           includegraphics[width=textwidth]{Figure_left_bottom.pdf}
%       end{figure}
        footnotetext{Figure left bottom}
end{frame}