A small but interesting survey run by crowdsourced copy editing service GooseGrade concludes that they do.

GooseGrade进行了一项有趣的小型调查，得出的结论是肯定的。

youdao

That got me to the "RTP" or "release to production" stage. The production people oversaw a copy-editing cycle: ironing out spelling, grammar, punctuation, and inconsistencies.

这使得我进入了RTP(生产前的发布)阶段，出版者指导了文字编辑的周期：修正拼写、语法、标点和前后不一致的地方。

youdao

My job was to fix the grammar and English of the translators as well as more standard copy-editing.

除了更多的常规编辑外，我的任务是修正翻译人员的语法和英文。

youdao

With the edited and formatted copy in place, Reinertson moved to cover design, copy editing, and formatting.

FORBES: Could You Write A Book? Should You? (Read This First)

Documents go through many stages, from researching ideas, to outlines, to collaboration, to review, copy editing, approval and publication.

FORBES: Death of The Document

And proofreading is perhaps the least important purpose of copy editing.

CNN: Why 'Amercia' needs copy editors