Only if there is direct connectivity (or router has port forwarding set up), there is no firewall or port is open, one computer has ssh server running, another one has ssh client jnstalled, you know the username on remote computer, you know password or have ssh key set up, and if copying from remote machine, you know exact filename or at least a location. None of that is given, especially if one of the ends is a cell phone.
I agree. The state of mobile tools is severely hamstrung by the fact that the overwhelming majority of the ecosystem is on closed platforms
I'm not sure how you would propose to solve the other problems, such as "the computers can't communicate directly" or "you don't know where the file you want is" but that doesn't seem like a problem with there being proper tools available
