[Mediawiki-l] Image uploads - "Save anyway" button

[Oliver Lineham]

Hi,

I'm running beta4, and when a user uploads a .gif file, the next page just
has the usual warning message (".gif" is not a recommended image file
format.), but neither of the buttons ("Save file", or "Re-upload").  It's a
dead-end.

Is there a regexp/variable somewhere I can set the list of file formats that
do/don't trigger a warning?

Alternatively, is there a setting I need to use to turn on those buttons?  I
thought it might be in the MediaWiki:badfiletype message, but it's not.

Thanks,

Oliver