Testing file uploads in Discourse/Testing Making topics Wiki Posts

The following file types are supposedly supported for upload:
jpg, jpeg, png, gif, slp, zip, mov, pdf, doc, docx, xls, xlsx, ppt, pptx, txt

mov files must be 3072kb or less.

Other than flipping the switch to make something a Wiki Post, what does it do? Let’s it be editable by any user on the forum.