Click below the message field and click "Save as draft" to save a draft.
※You can save up to 10 drafts.
If you try to close the window or move to a different page while you have an unfinished post, you will see a pop-up message asking if you want to save it as a draft or delete this message.
If you click "Save as draft", to save a draft and it will be added to the "Drafts".