My switch from an iPhone to an Android smartphone was motivated in part by the fact that Android permits a device to act like a storage volume (e.g., disk drive). Until a month ago, that worked, but it was awkward, requiring several steps with a setting named “USB Utilities” and the USB cable. As of the current version of the Android operating system, however, just connecting the device to a qualifying computer with the USB cable is enough. The computer recognizes the device, as it would recognize a USB disk or thumb drive. If the computer is a Macintosh, the user must first download and install the Android File Transfer application, but that’s an easy one-time prerequisite.
Another part of the reorganization was to unify the file systems. So, when you plug your device in, you see more directories to read from or write to than was true before.
I mention all this here because I was initially mystified by the change and looked all over for an answer before ultimately telephoning the helpful service folks at CREDO Mobile. So the information could use more exposure, and this posting is one small attempt to provide that.