Any steps outside the usual install procedure to upgrade from 2.27 to 2.28?

I'm going to answer my own question...

After upgrading to FreePBX 5.211.65-15, I was having a problem with FOP2 not showing the toolbar, but showing a row of "Download File" entries instead.

So I followed the new install procedure through "make install" and restarted the FOP2 service. All is good.

The only thing that tripped me up what the new FOP2 Manager interface; it wasn't immediately clear to me to login with the FreePBX credentials, but after some trial and error I got there.

At first glance the only thing I'm not seeing are the "Sort button" mentioned in the help popup in the Buttons tab; I don't see any way other than drag/drop to reorder the buttons. Otherwise this new interface looks very nice- some new features, clean, good UI. Nice work!

Thank you, I see it now.

Maybe consider updating the popup help from the little "I" next to "Buttons' in the green bar, as this indicates that the Sort option is "down below".