I'm not sure where to begin. In Lion, and also in Mountain Lion, making a copy of a document is most easily done by clicking on the Document Name at the top of the Pages Window and Selecting Duplicate.
If you are looking for "Save As" because you want to change the file type, choose File > Export instead.
If you don't really need iCloud and don't care to spend time tring to figure out what is causing the null files, just turn off Documents in iCloud preferences and your options for saving in Pages will revert to just showinng the local drives.
Some people have troubles exporting as a PDF Mail attachment. If works, but again, if you don't want to work through the issues that might be prevenging it, simply Print > PDF > Save as PDF and then attach the PDF file to your separately created email.
Have I come close to addressing your challenge? If you can help me to understand the motivation I may be able to focus in a bit.