I edit, proof and format for KDP publishing. I have twenty years of experience with spelling, grammar, punctuation, finding continuity errors and matching syntax. I always work in word with track changes and I also use the notes function to let the author know of any issues.
I will always send back at least two copies of a project. One will show all changes I made or suggest and any notes. The second copy will be clean and ready for the author's next step.

I also am available for formatting for ebook and print publishing. I only format for KDP, and will also be happy to do the uploading for you.