I have the following problem.
1) I created a window model for my project.
2) The window looks great and it is transparent.
3) When rendering (using a plugin or standard tools), the glass looks transparent. But the window does not let in sunlight from the open world.

That is, I see everything that happens through the glass. The sun is shining but the light does not penetrate into the room. I don't see shadows from the window frame to the wall, etc. If I use a standard window model, the glass is transparent and also lets in sunlight.
What can I do?

link download my model DAE in RAR archive studioslash.ru/windiw.rar