Customize settings of running container and sync across whole fleet

Is it possible to run a container on one device, adjust the settings of the running image and sync across whole fleet. Sync the /data folder across all devices?
I use kiosk and I want to install specific extension and then I want to deploy my customizations across whole fleet?

Hello @roli welcome to the forums and thanks for you question.

An idea that i have is that you can pin application fleet to a release, and run one device to the latest release where you test all the changes. When everything works, you can pin all the fleet to the latest release.

Check here for more information Release policy - Balena Documentation

Let us know if that works!