Overview
To access files in a subsystem, you can use the built-in protocols to do so.
Windows
In the explorer address bar, type win-sftp://C:/.
Linux
In the explorer address bar, type sftp://linx/. This shows the root folder /.
Android
Use the a-sftp://a14/. Depending on the version of android used, set the number to the correct version. Android 12 and 12L (or 12.1) both use a-sftp://a12/.