Our organization has been using the HTML macro in Confluence Server for many years as a way of embedding <iframe> content. When we migrate to Confluence Cloud next year, users will be able to use the iFrame macro for this use case.
In preparation for this migration, is there a way to ready the content so it will not break when it migrates? The iFrame macro doesn't exist in Confluence Server, so we can't ask users to update their pages in advance. It seems that they will need to wait until content is migrated, find all the places that display "uknown macro: html", and then change this to the iFrame macro.
Any ideas/suggestions are welcome!