The MediaWiki official documentation for enabling file uploads is very thorough, but if this is a new installation (and it’s probably likely if you are enabling file uploads), it can be somehow stripped down to get the functionality simply up and running quickly. I still recommend reading the whole documentation to make sure you tweak the system in the best possible way, and so you don’t forget the necessary security precautions.

Also, if you are running the Tweeki theme for MediaWiki, there is one step that is not mentioned in the official documentation and that got me stuck for a while. So this article shows you how to enable file uploads in MediaWiki when you are using the Tweeki theme.

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