To get round this you need to either disable the Optimise Mac Storage setting or, if you are feeling brave, use a symlink to redirect your Sims 4 folder to an external drive.
Drag the ‘WonderfulWhimsMod’ folder directly from the archive manager to the opened The Sims 4 Mods folder. The content is clothes, and there are about. package form, and are not in any subfolders. The files are in Documents/Electronic Arts/The Sims 4/Mods. With over 50,000 Mods and CC creations to choose from, youre bound to found what youre looking for Lots of reports of CC and Mods not showing up in game recently so I thought a reminder on where your Sims 4 user data folder must be located may help. The problem is, when I open CAS, the content is not there. Discover and download the best Sims 4 Custom Content and Mods at The Sims Catalog. If you keep adding files it will in fact push more files to the cloud. If the ‘Mods’ folder is missing, turn the game on and off at least once. I downloaded a load of CC, and when I open the game, I get the popup that confirms that those mods are installed. If your internal storage is getting full it doesn’t matter how many files you keep adding to the Mods/Saves folder, the older files will be stored only in iCloud where the game cannot access them. Older documents will be stored only in iCloud when space is needed. If your CC/Mods aren’t loading in-game, and you have checked that the CC/Mods are properly installed, it is most likely the same reason as saves not loading, your iCloud Drive settings are pushing data to iCloud because your internal storage is full and you have Optimise Mac Storage enabled in System Preferences > Apple ID/iCloud.