Re: I moved my game from on hdd to a sdd, but the app refuses to use it
@Lucksbane13 There are two separate locations for Sims 4 data: the game's program files, which you've already moved to the SSD, and the user data. The latter is always located in Documents > Electronic Arts, and if you move the Sims 4 folder inside, the game will create a new folder there with no content, which is why it's now not loading your saves.
You have two options here. One is to move the entire Documents directory to your SSD, which is simple and supported by Windows. But this is only a good idea if the SSD is internal; if it's external, please do not do this.
https://www.tenforums.com/tutorials/74952-move-location-documents-folder-windows-10-a.html
If you only want to move the Sims 4 folder, or the Electronic Arts folder it's in, you'll need to use a symbolic link to tell the game where to look: