You tried what, exactly?
There's also Git Large File storage. I was doing a little reading and installed that as well before I did my commits, so maybe that's all you need to do, but I'm not sure. I don't know why there's a separate thing to install or if it even matters, but I read about that here: How to Git with Unity (thoughtbot.com)
Don't worry about the setting up of version control through Unity if you don't want to, you can just commit the way I mentioned below, I believe.