I suppose that's because the last update. I have a lot added to my library to prove that was possible.
Add games to library from analysis

There is an icon for adding to the library, at the bottom of the analysis page. Just tap or click, then a dialog will appear to add the analysis to the existing library.
To add a game, just open any game on Chess.com, it doesn't even have to be a game you played! From in the game, you'll see the Library icon on the bottom, under the other buttons: Click the library icon, and then choose which collection to add the game to, or create a new collection for it right then and there!
Why is it so hard/impossible to add a game that you've analyzed to the library? Can't there be an option to do so from analysis. You can save them but it's so difficult to find it and manage it again.