This question isn't a duplicate of Can I use an image located on the web in a LaTeX document? but a more specific version of it for Overleaf, since none of the answers given there work on that E.g. the accepted solution (with a real-life example picture)
\documentclass{article}
\usepackage{graphicx} % includegraphics command is implemented here
\begin{document}
\write18{wget https://www.wikipedia.org/portal/wikipedia.org/assets/img/Wikipedia-logo-v2.png}
\includegraphics{Wikipedia-logo-v2.png}
\end{document}
results in
File `Wikipedia-logo-v2.png' not found on input line 6.
Is there a working solution of this for Overleaf?