Not that kind of galley. A book galley!
What is a galley? Once your book is all done and the edits are completed, the publisher sends you a galley to review prior the book goes to press you get one more look at it to make sure everything looks good. The purpose of this review period isn’t to rearrange passages or refine grammar, it’s to check spelling and simplistic mistakes so that they don’t end up on the page.
When we have done galleys, it’s a very strict process. You indicate the page number, the paragraph number and then the word or words that need to be corrected. They’re done with a pretty quick turnaround.