To copy your files from OOD to ARE you need to use the scp sftp tool. You can either do this directly using a Gadi login node (ssh command from your computer or ARE Gadi terminal app) OR as a 2 step process from your computer.
...
scp sftp -r abc123@vdi-sftp.nci.org.au:DIR/FILENAME.txt
scp sftp -r abc123@vdi-sftp.nci.org.au:. ~/ood-home-copy
...
If you would prefer a graphical transfer method then you can install a graphical SCP SFTP client on your computer and use it to first get your files from vdi-sftp.nci.org.au
and then transfer them to gadi.nci.org.au
.