How to save a physics animation? I have a file I want to play around with and it takes a long time preview physics animations like rigid body and cloth interactions. However, I hit the play button and after waiting 5 minutes for it to buffer, I like the result. The problem is that if I close the file, blender deletes the rendering of the physics for no reason. How can I save it for the next time I open the file but still modify it?
You have to  bake it. What you did looks probalby like this

But there  is  a better way to do it. Go to the physiks panel and go to cache.

Now you have to bake it till the frame that you want it to have.
Now you have a blue that looks like this.

Now you can save the object and when you open it again, it will stay as it is.