I have installed Kies 3 under Windows 8.1 and can see the files on my Note 4 in Kies. Nothing is visible in Windows Explorer (or Total Commander, for example), until I select "Browse files" from the context menu of the phone in "Devices and Printers". This enables me to see the entire contents of the phone (both internal and SD storage) in Explorer, but the phone does not appear as a removable drive on the PC and is therefore not visible at all in Total Commander. I see all files on the smartphone, regardless of whether I select PTP or MTP on the phone, even though Samsung tech support says that only the DCIM directory is visible in PTP mode. The only difference I observe is the placement of the phone in Devices and Printers. If I select PTP, it appear under "Devices" as a camera, if I select MTP, it appears under "Multimedia Devices". I can copy files in both directions. Is this the most I can hope for? I have tried most of the tips offered in this and other threads, in hopes of seeing the phone as a removable drive. Sometimes it appears in the systray menu with the "Remove ..." option, but it never shows up as a drive. Is this what is meant by the statement "USB Mass Storage is LOOOOOONG gone from Android."? I am running Lollipop (5.0.1).