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No, this is not true.

You are allowed to edit your post before the payout takes place (i.e. until 12h after creation) and editing does NOT affect the payout.

From what I know, yes.
So make that first as good as possible. Always upload pictures to separate sites like imgsafe.com . Don't mess with the code much. Always best to write a post with one go.

There have been some misinformation about it - a couple of days ago some people mistakenly believed this was the case. But it's not like that. As far as I know, editing a post does NOT affect the payout.