How do you find and load an autosaved level in the Portal 2 Test Chamber editor?

I was working on a level, hit save, quit, and after returning to the editor the level was in a previously saved state. Is there a way I can check if there's an autosave file containing these changes and load it?


You should be able to go into your workshop levels and then you should see your autosave if not it is probably in single player or co-op levels depending on what type of map your making