Write.as post->edit->publish workflow

Looked like my posts that I did not promote to the blog were being promoted anyway when I edited them and clicked :Publish", I tried this test post and sure enough, it does not appear in my “Posts” list, but does appear at the end of the blogs.

Is that what is supposed to happen?

If so, how can I start a post that I do not want to appear in my blog, but do want to share with co-authors before put into the blog? And be able to edit it several times, and save the edits, without promoting it to the blog? Especially save the edits among more than one person without needing to click “Publish”?

I’m sure write.as provides some instructions for doing this that I have forgotten, but it would be a kindness to point me to the correct instruction page.