Re-Sync behavior? Messages on Library

Probably a dumb question. I'm just trying to make some space on my mac as I currently have 67GB of "system files" used and probably full of a bunch of stuff I don't need physically on my computer if I have it on iCloud too. I'm wondering, if I delete certain stuff icloud related such as all the attachments from messages, will mac/icloud try to automatically re-sync them all when gone? https://preview.redd.it/7on1ov59cj6e1.png?width=571&format=png&auto=webp&s=67356b684494e9a3c6e67b98a479894a1490f695 I'm only interested in keeping the messages, not attachments.