The post editor replaces the plain text box. It formats as you write: headings, quotes, lists, links, bold, italic, strikethrough and separators. Images come from your image library and keep a caption. A video is a Screen Recorder recording, or a file uploaded from the editor, which is saved to Screen Recorder as well. A published Form from the same Personal or team can be attached as a poll or survey and is shown under the post. A cover image shows above the post and in the list.
The same text can be edited as Markdown from the post's More menu, and the app keeps editing posts as Markdown.