ignorancea827 It sounds like OneDrive may have synced files from your old computer and downloaded them onto your new one. Whether the files are recoverable depends on whether OneDrive deleted them or merely renamed or trashed them (without a deletion, yet). Please see this guide to missing user data:
⚙️[PC] Sims 4 Missing User Content (saves, mods, etc.) | EA Forums - 12636780
Feel free to ask further questions, but I'd like to know what you find first.
The Gallery has been spotty lately, but I'm not sure whether what you're seeing is related to a game issue ore another consequence of OneDrive interference. If you don't have any use for it, I'd suggest getting rid of OneDrive entirely; you can still download files its saved, but it wouldn't touch your current data. Various options are covered here:
