There is a pencil icon on top‐right of edited posts.
By clicking it you can see its edit history of changes !
It’s only when you edit your post after people have read, liked or replied it.
You can test with this post as I have edited after some reads !
Another hint, cool post editor keyboard shortcuts:
CTRL+ENTER to submit post
CTRL+B for Bold
CTRL+I for Italic
CTRL+K for hyperlink
(I edited in place as there are no posts below yet)