I now I can quite easily move files from the host into a GNOME Boxes VM. On Linux guests this mostly works out-of-the-box, on Windows only after installing SPICE IIRC.
Also, there is a menu entry “Send file…” I can easily use send the file.
But how can one actually move files from the guest to a host?
Drag- and -drop did not work for me in this case.
On Windows I can at least use the way to mount paths into the VM. (But I cannot even see this in GNOME Boxes right now. Don’t know why it is not there, anymore.)
But is not there a different, more intuitive way?