Two easy ways I can think of:
1) A program called Samba will allow you to make a directory on the Pi available to other machines.
Once set up, you can use the built in command mv to move files from the local directory to the remote one.
Samba is not too hard to get set up but it will take a bit of work.
2) If you can ssh from one Pi to another, you can use a program called scp to copy files over using a SSH link.
This is documented at https://www.raspberrypi.org/documentati ... ssh/scp.md
and is the simplest of the two
PS Who’s this Andy guy