Labelling of figures in appendix won't work

[marcianito]

When I use the latex files to compile my manuscript for submission, the figures in the appendix are labelled consequentially, following last numbers in the main text and not the needed labelling syntax required for the appendix.

How can I fix this or work around it?

Here is the way I inserted the figure:

\begin{figure}
\centering
\includegraphics[width=0.75\textwidth]{figureName.png}
\caption{...}
\label{fig:B1}
\end{figure}

Thanks in advance!