A Microsoft file hosting and synchronization service.
Hello,
Are you signed in at onedrive.live.com with the same Microsoft account you used in 2023 to upload those files? Can you check the OneDrive Recycle bin and the Second stage recycle bin, then use the Search bar and filter by date for 2023 to 2024. You can also select Settings, Options, then Restore your OneDrive to roll back to a previous date within the last 30 days if the files were recently deleted or changed. If the files were never synced from your device, they will not appear online. Let me know what you find.