Thanks for using Codebook and posting to the discussion forum with this suggestion. You make some good points about consistency with the way each OS handles duplicate filenames. I’m going to bring this up for discussion with the rest of the team. If it’s included in a future update, we’ll mention it in the release notes. Thanks!
Add my “me, too” in support of this! I’ve trained myself to look for the “copy of” in the list, but this suggestion makes perfect sense for user convenience - whether or not is also drives consistency with other practices.