Can FileImporter follow this syntax on en.w. so that the file isn't categorized in en:Category:Wikipedia files with the same name on Wikimedia Commons as of unknown date. Now you have to date mark the files manually but this can be fixed if FileImporter would use subst:. This is the syntax that should be used:
Same filename on Wikimedia Commons:
{{subst:Now Commons}}New filename on Wikimedia Commons:
{{subst:Now Commons|NEW FILENAME.ext}}Thanks!
The feature is designed to work with all wikis. Not all wikis use subst:. We would need to somehow distinguish between wikis that want the "Now Commons" template to be placed with subst:, and wikis that don't want subst:. While it might be possible to implement this, it requires resources we can not spend on other things then, it requires a new configuration and someone who keep it up to date, it complicates the code and the process, and it's a new source of errors. We will have a look in our next FileImporter sprint, but no promises.
That's understandable, just wanted to bring it to attention. Thanks for you answer’