Change PDF files in iBooks

Hi,

I'm trying to change the titles which you can generate via safari.

Example: you generate a PDF from safari to iBooks and the automatacally name of the PDF is "house" and you want to change the file name into "home". It works but if you leave iBooks and go in again the file name returns to "house" again. At the former version it remain to the new name but not now. The same if you do it with a photo.

Can somebody help?

Thank you