I am following the instructions in http://sharepointinterface.com/2013/01/22/custom-ribbon-button-image-limitations-with-sharepoint-2013-apps/ (and other walk through pages) both on my on premise DEV site and on a new 365 DEV site. In both cases I get no errors but there is no added ribbon item.
Could it be that this functionality was eliminated in the newer versions?
Could it be I am missing a step?
Thanks