remote vm file transfering

I'm pretty new in Proxmox and I'm trying to configure my home lab. The problem is a very bad file transfer speed between physical hosts and Proxmox. (Intel i7-5820K, Asus X99-e, 64GB DDR4, Realtek RTL8111/8168/8411 NIC) When I'm trying to transfer files to Proxmox or to VMs or between VMs I can...

Hello i been searching online how i can let my brother use his usb flash drive on his home computer to pass the files to a vm he has open on his desktop. But the search i went through mostly all say to have that flash drive on the same server that is running the proxmox. Is there a way that he...