I wanna share /mnt so I can download stuff to my hard drives
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Thats the best answer. The other option is to use Spice, which will require installing the qemu guest agent on the guest OS.
Not sure, I usually mount a network share that is accessible from both machines.
I use fedora btw
When I exchange files between host and guest, I usually just go to the directory I want to share and run
python3 -m http.server