"Edit Document" for embedded excel document does not work in MacOS X with FF & OpenOffice

Cannot edit an excel spreadsheet embedded within a Confluence Cloud page using Mac OS. Checked online User Guide, Support pages & knowledge base. All docs say that this should work with OpenOffice, but it does not. Only reference with any useful info was a feature request, but this is not an added feature, it is a non-working existing feature that you advertise as being included. Either fix your documentation to specify that this only works from Windows machines or make this a priority to fix. Not being able to do this cuts the usefulness of Confluence Cloud by ~30%. Huge impact for my organization.