Downloading custom sims

I’ve tried multiple of times over the course of many years to download sims from places like Patreon. Everytime,I download all the custom content and all the tray files.I put the tray files in the tray and the custom content in my mods.I make sure they aren’t in subfolders in both sections.Ive tried to uninstall the ea app,repair the game,search for these sims in my gallery (with custom content selected) but I can never find this sims I have downloaded.Could someone help with this please?