User blog comment:MisterWoodhouse/The first migrations to the Unified Community Platform/@comment-1852193-20200929120238/@comment-24692230-20200930101740

The summary, show changes, and preview should be at the bottom of the editor, categories/templates can be added either via wikitext if you're using source, or via the editor toolbar if you're using VE, and media can be added via both ways.