To add to Jhieminga and Capn Bloggs correct replies.
More recent Android versions connect via USB to the computer by employing either Picture Transfer Protocol (PTP, a protocol that is shared with many digital cameras) or Media Transfer Protocol (MTP, an extension of PTP for additional types of media). Neither is recognised by Windows as a storage volume - which it needs to be if a drive letter is to be assigned.
Workarounds exist that involve setting up a server on the Android device but at this point of my own learning (yesterday, as it happens when I was trying to get Windows to assign a drive letter to my Android smarthphone so that my backup utility can automatically transfer new music files found on my NAS) I gave up. Too much hassle for what I wanted.
Last edited by The late XV105; 15th Mar 2017 at 12:24.
Reason: Spelling and clarification