Digital Light & Color

If user connects phone or camera to a USB port, there is no drive letter associated with the source folder.

It would be convenient to identify the source folder by path name rather than by drive letter.

The source is not always a SD card

I tried implementing this but it turns out that phones or cameras connected via USB are not part of the file system since they are implemented via shell extensions to look like drives but actually are not files. Thus the folders do not have a pathname you can select and use the way you can use pathnames on a disk. While it looks like it is theoretically possible to make this work, it involves a lot of poorly documented or undocumented Windows features.