you can use a regular ftp server with administrator and user rights, distribute rights to those who replenish, and those who just take - guests at home I transfer in this way from computer to computer without connecting them to a common network, what could be simpler? why invent some ways with keys or bash if there is a 40-year-old technology that just works great, and to open ftp it is enough to enter the IP address in the explorer

you can use a regular ftp server with administrator and user rights, give rights to those who replenish, and those who just take - guests