Documentation of SAC algorithm?

Thank you again very much! You have answered me very detailed in Clarification of PPO source code . My question for now is again in this post Clarification of PPO source code

→ If I will use the low-level Python API, I can build the environment from Unity and import it in the script.
At the end will a .nn file be created? So I can see my trained agent or this is not will happen?