Tex insert a picture / insertion flowchart tikz

Insert Picture

\begin{figure}
    \centering
    \includegraphics[width=0.75\textwidth]{figures/figure1.png}
    \caption{caption of figure1}\label{fig:figure1}
\end{figure}

Insert tikz flowchart
flowchart of the code written in the flowchart / flowchart1.tex file.

\begin{figure}
    \centering
    \input{flowchart/flowchart1.tex}
    \caption{caption of flowchart 1}\label{fig:flowchart1}
\end{figure}