How do I insert an image into my document?

Firstly, in order to include an image in a document on Overleaf, you need to upload the image file from your computer using the "Upload files" button in the project menu:

Then you can include them in your document using the \includegraphics command, such as in this example:

\documentclass{article}
\usepackage{graphicx}
\begin{document}
\includegraphics[width=\textwidth]{YOUR-FILE-NAME-HERE}
\end{document}

How do I insert an image into my document?

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