I found where the Ubuntu file system is on Windows 10
C:\Users\{username}\AppData\Local\lxss\home\{username}
For some reason the lxss/ directory doesn't show up in Windows File Explorer. but if you type it in the title bar it shows up. Now when I copy a file from the Windows file system into my home directory in the Ubuntu file system the Ubuntu file system doesn't show the file.
How do I get interoperability between the two file systems?