I couldn't find a repository. Sorry. I felt like I was really close here, but no.

  • GitHub might be the right place. It depends on the feature and what component of the OS it's related too. Nov 8 '17 at 19:20

elementary is now hosted on GitHub. So just go to the right repository and open an issue. This is the repository for pantheon-files

This is an example of a feature request I made for AppCenter. https://github.com/elementary/appcenter/issues/411

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