Can local images be pushed to a mirror for use by services?

Docker Engine
1

I have a local docker registry v2.5 functioning as a mirror as per Mirroring | Docker Docs.

Is this feature designed to support pushing local images into the mirror for use by docker swarm mode services or is it intended solely as a cache for external repositories?

2

This issue from Aug. 2015 says that pushing to the mirror was not supported. Not a blocker in any case…