Another issue to note is that when you copy edit you are likely to introduce new issues (particularly is you are changing words around). So a second pass-through is always a good idea. Think of the story like an octopus. Every arm (or mistake) that can slip out, will. It's nearly impossibly to get all the arms gathered up and dealt with, but the more you revise, the more likely you are to succeed.
Reading your story backwards, sentence by sentence can help a lot too. It feels like reading a random text, and you can concentrate on your mistakes.
I also read the story out loud or record myself reading it helps with editing. TY, for including the info about spell check, I've read passages I've written. Spelled things correct but it wasn't the word I intended on using. Which of course made the whole sentence or idea of that paragraph make NO sense. (Lol)