Unused Assets in Library?

Is there a way to automatically find out what assets in your library are unused? When I began this project, I was doing Tweens backward, so making 3-4 instances of symbols and a lot of them are unused. I can go through one by one and see which ones break my animation if I delete them, but its a 2 minute animation and with 60 assets, at least half unused, that could take 6 hours.

It'd be nice if there was a way for Animate to say, "Hey, you have unused assets that are driving up your project size and here they are: ... Use or delete them to save space..."