I haven’t tried this myself but you could use a custom group. Go to the Panel => Users => Manage Groups and add a custom group that your two users are members of. Then they would have access to each others home directory as long as you haven’t set the permissions not to allow access to the same group.
As long as the users are on the same server you can use the Linux commands to copy and move files.
Say I’m in one of my home directories and want to copy a file I use one of the commands:
cp filename.ext …/other-user/filename.ext
cp filename.ext /home/other-user/filename.ext
For moving files, use mv instead of cp. You can use “cp --help” and “mv --help” if you want more information on how to use cp and mv.