I'm currently using SFTP to send files between my phone and my Linux PCs, with OpenSSH server on the PCs and Ghost Commander on the phone. What is inconvenient is that I have to either type the password each time (on screen keyboard!), store it on the phone, or try to setup
authorized_keys (which I'm hesitant to do for a mobile device, since it lets it do anything, not only send files). Using something like an FTP server without authorization is not an option: I don't want to get files from everyone around without a means to reject a transfer.
I'd like to be able to simply "offer" to send a file to the PC and, when the PC accepts this offer (the user clicks "Yes"), do the transfer; similarly in backwards direction — much like Bluetooth file transfers work.
Is there any software (zero-cost and ad-free) offering such functionality?