Renaming of uploaded files has been disabled for the last couple of months pending software updates; as of today it is now re-enabled for admins on all Wikimedia sites.
Local admins can now rename files as well as deleting them; this makes it easier to track history for images and other media that need to be moved to another name.
— brion
Update 00:49 UTC 22 Sep: We’ve tracked down a bug which at least on en.wikipedia would cause the redirected old name to stop working for 24 hours. Now fixed; notes for cause and workaround on enwp Village Pump.
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