[BRX]

If you click the path field, does it not pop up the Microsoft file chooser so you can pick the folder? That's how it is supposed to work. 

I think you are seeing that issue because you are using a removable SD card for your storage location on Android 5.0+. I only have one device with an SD card that I can test with, but I'll see if I can reproduce what you are seeing using that.

I'm back at my W10 desktop. Again, the Microsoft file chooser doesn't pop up. I can edit the name field but not the folder path.

Did you mean this problemis Android 5.0+/SD Card related? Very unlikely since this problem is there without any connection to an Android server and W10/MSP started as standalone. Also there are no SD cards in my desktop. (I will test on my Surface which has a SD card I want to have the sheets folder on, but didn't get to that yet).