Once you have the network setup it’s trivial to get file transfers up and running via FTP compared to messing around with sharing folders and such.
1.) apt-get install vsftpd
2.) Set local_enable=YES and write_enable=YES in /etc/vsftpd.conf
3.) Login in to the virtual machine as root with FileZilla via SFTP - SSH File Transfer Protocol and Logon Type: Normal with your root user and password.