NAS540

It's some time ago I used Windows, and I don't know all it's fancy new features. In the 1st and 3rd screenshot the NAS is clearly recognized as a media device, able to stream video's and music. I don't think this interface is writable.

I'm not sure about the 2nd screenshot. It looks like a view to the Samba interface of the NAS, in which case you should be able to put files in the Music, Photos and Videos directories, but not in their parent. Windows calls it 'Folders' here, but it are shares.

If you can't write to those directories, try to put \\NAS540\Photos\ in the address bar of Explorer. It should ask you to login (although it's possible that the login is cached, somehow) and the directory should be writable.