At the moment, the Confluence Cloud Migration Assistant is not supported, but will be in the future. We have completed the prototyping for the automated migration and estimate a fully functional and automated migration experience will be available until the end of 2021.
Migrating before automated path is ready
It is rather difficult to migrate manually and we highly discourage you from doing it. If you still decide to take this route, you will have to:
Manually export the dropdown sets and options from your database
Manually import the data into your cloud instance
Scan for all pages with EDM dropdown macros and replace their storage format representation as the schema has changed
Scan for all pages with page property report macros with EDM filters and replace their storage format representation as the schema of the filters has changed