Hi Adam, thanks for your reply. I'm administrator. It seems that this feature only works for Other Action (see attached screenshot). I can publish 'Open dashboard' action without problem but when I try to do the same with Import Action it doesn't work.
Before the most recent update you could only create buttons by publishing actions that weren't for importing and exporting. In the most recent release support for publishing a button to execute an import action was added, however, export is still excluded I believe
Try it again!