TheWitch_Kris If OneDrive has ever been running on this computer, whether you've used it or not, try looking on onedrive.com, both in My Files and the Recycle Bin. The file names would be seemingly-random strings of characters, but you'd recognize them by the fact that they were or had previously been in a Tray folder. If you find any there, restore them.
You can also search your computer for a Tray folder. You'll have one that's likely empty, but perhaps there's another one somewhere. Open a File Explorer window, click This PC in the left panel, and enter tray in the search field in the upper-right corner of the screen. It may take a while for the search to finish. Check each result for stray files.
If you do find Tray files and restoring them to Documents > Electronic Arts > The Sims 4 > Tray doesn't help, please post a screenshot showing the file names and sizes.