CC Tray files not appearing in-game.

LifeOn_Sims4​  If you add another household or lot from the Gallery, or save one of your own, do any new files appear in this Tray folder?  I ask because it looks like you've only added two items to this folder, and it sounds like you've tried more between using the Gallery and installing your own files.  It's possible the game is reading a different folder instead.  So please add some item from the Gallery or your own game and see whether you get any new files in this folder.

If you don't see new files, please find the full path to the folder the game is reading, as described here:

https://sims4.crinrict.com/eng/2018/07/how-to-find-your-user-folder/

Then add the Tray files you download to that folder.  If one item doesn't work, remove its files and test another.  And make sure the "include custom content" box is still checked when viewing your Library.