Click Move file on the project you want to migrate
Click Convert for Desktop
The conversion takes place
You will land in the editor for the new version of Express of the project you move. To see your projects from the old version on the new one, go to "Your Stuff" and click on the file name "Originals".
We recommend logging out and clearing the caches if you're not finding your current projects created within the new version. You can log in with a new page or in incognito mode. Please share a screenshot if the issue persists.
We hope this helps you. We are here if you have any other questions.