Home network visibility

I am setting up a network in my house and I am facing a problem. I caot access my home NAS server that is currently under the second router from PCs that are coected to the main router, this image describes my problem:

Everything that has address 192.168.1.x I caot access from computers coected to 192.168.0.x router, is there any solution or the NAS server has to be simply coected to the main router to be visible from all the PCs coected ?

The PC that si marked red in the picture has no problems with visibility of NAS server.

Thanks for any advice.