The source wiki edit and delete features are currently enabled on production, since ~ 11:30 UTC, September 18.
The feature was first enabled and available to our users from roughly 13:00 UTC on July 22 until 13:30 UTC on July 24.
- Import a file to commonswiki, as a user without admin privileges (but you need to be confirmed) on the source wiki. Enable "mark source file". Check for the NowCommons template prepended to the source file, in your name.
- Import a file, as a user with admin privileges on the source wiki. Delete the file. Verify that the original was deleted.