Here is a Guide for newcomes to Qubes OS who wonder how to copy files and directories from dom0 to a VM, from a VM to dom0 and and in between VMs, as well as doing that with and without the GUI prompt.

https://www.blunix.com/blog/copying-files-and-directories-in-qubes-os-from-and-to-dom0-and-between-VMs.html

PS: I know the explaination for the asterisk in https://www.blunix.com/blog/copying-files-and-directories-in-qubes-os-from-and-to-dom0-and-between-VMs.html#copying-files-and-directories-from-one-qubes-vm-to-another-vm-automatically-for-example-in-scripts is missing - I'll add that as soon as I fully understood what it does exactly (I remember all this from 3.2 with the old policy lol)