I was watching a video series on configuring heartbeat and saw the presenter had a heartbeat flag enabled as an attachment. My attachment options did not include that so I checked my install of Flag and saw that the heartbeat flag was showing as disabled and the only operation available was "update code" that opened to an export/import option. There was no option to enable it.
I looked at the heartbeat documentation and it didn't say anything about how to enable the flag. Then I got an idea. Copy the export code and import it.
Tada! Don't roll your eyes ... ;-)
So ... just wanted to document this for anyone else pondering what to do about the disabled flag.