My new Samsung S10 Plus (Android 9 - 2 days old) seems to be in an odd state. I work on a Mac and used the Android File Transfer app to access memory on my old Samsung S7 edge, but the Android File Transfer app seems unable to find the new phone at all. I assume that the usb setting is in the wrong state and I have been looking for the setting to change it to File Transfer Mode, but have been unable to find it anywhere in setup. Typically on the S7 I would plug the phone into the Mac, tap on the resulting "charging" notice and that would open a dialog box for me allowing me to set the mode but I do not get the same "charging" notice on the S10 Plus and when I do press the notice that I get I do not get any way to set the transfer mode. How can I set the mode to File Transfer? I have been thinking that I might need to reset the phone and start all over, but would prefer to not have to do that.