How to apply upgrades to the served app after the inital 'launch'

I have an app running successfully (having followed this Getting Started · Fly Docs ) and I now want to make a change to it.

I thought flyctl image update ( flyctl image update · Fly Docs ) would do what I want but when I try that I get an error message “Error image is not eligible for automated image updates”.

How should I go about doing this please ?

OK, answering my own question for others reference.

Using fly deploy will pick up the latest version available locally and “deploy” it as the currently running version.