Left align figure in multicols environment beamer

I have already seen this and this and this and this.

I have one section of a beamer poster:

headerbox{Results - Base Model Performance}{name=performance,column=1,span=2,row=0}{

begin{multicols}{2}
Text here about base model performance. This is the entire column.

begin{center}
includegraphics[scale=0.5]{Fig3b}
end{center}

end{multicols}

I cannot use a figure inside a the multicols environment, because I get a compilation error. Originally, I had:

begin{figure}flushleft
includegraphics[scale=0.5]{Fig3b}
end{figure}

But of course that wouldn’t compile.

How can I align the figure to the left of the column?