I could not find "Settings - Storage - Menu - USB Computer Connection" option. Do you mean USB connection Mode? It is now different in Lolipop. In KitKat I had a setting PC Connection mode. Now I don't have it. When I connect by USB I can choose smth. like Multimedia, Battery Charge and one more...
But I found another workaround. When I locate the files by LG File Manager feature I can long hold a file and then the dropdown menu offers Copy, Move, Delete and more. And I can copy or move the files to my SD card where they are accessible from PC. Maube its not so straightforward as directly from Internal storage, but it works.
Maybe I still will try to access the Internal storage, who knows. :)
Many thanks to you,
Maris