Thanks 🙂 I'm not understanding the issue though. If you don't have Optimise Storage enabled the game should load your TS4 files fine as they are still local on your Mac. It only becomes an issue when disk space is extremely low so iCloud Drive pushes everything to the cloud, hence the game can't see it. This is the setup on one of my Macs and it loads my saves etc. fine:
Players, myself included, have wanted the ability to chose where the game stores our user data since the game launched, even so far back as TS3. EA have never implemented it and are unlikely to now. You could leave feedback in the Feedback & Discussion forum if you like - https://answers.ea.com/t5/General-Discussion-Feedback/bd-p/the-sims-4-game-information-en
Your other option would be to create a symlink to store the Sims 4 folder in another location on your Mac or an external drive.
