GWToolset uses GWToolset\Handlers:UploadHandler:getFileExtension() to attempt to determine the media file’s extension. it uses php’s pathinfo and mediawiki’s MimeMagic to determine a valid file extension. if either of those methods fails, the file extension is assumed to be invalid.

sorry, didn’t know what the acronymn meant: Server Admin Log (SAL). thanks for your help.

SAL?

i just checked both beta and production and the whitelist config change appears in both environments. was the merged patch also deployed to production?

In T101513#1353176, @Krenair wrote:

wat? config changes get automatically sent to beta once they're merged in Gerrit, sure, but production requires a deployer to log into a deployment server, pull the change, and push it to the servers. Approving mediawiki-config patches in Gerrit but not deploying them to production can cause issues and make you unpopular with the next person that does want to deploy a config change.

based on past experience, once these config` patches are merged, the changes are available on beta and production in about 15 minutes. there was no need for a SWAT or regular deploy.