I have a document that has a handful of figures in it, and I am using
\tcbox{\includegraphics{./Pictures/image-name.png}}
to put a border around them. I end up repeating this for every image though. Is there a way to put something at the top of my document that says to apply this to all images?
If nothing else in your document relies on \includegraphics, you could try the following redefinition:
\documentclass{article}
\usepackage[most]{tcolorbox}
\let\includegraphicsold\includegraphics
\renewcommand{\includegraphics}[2][]{\tcbox{\includegraphicsold[#1]{#2}}}
\begin{document}
\includegraphics[width=10cm]{example-image-duck}
\end{document}