How to connect smartphones to the local network?

Question

Android

There is a home locale of five computers (three on Win 7 PRO, one on Win 10 PRO and 1 on Win XP - we do not take it into account, but if anyone has a solution for Piggy, I will be glad). Some of the computers are connected via wi-fi, and some are connected via cable.
I also want to connect smartphones there in order to fumble files directly from the memory of phones and their flash cards without wires, clouds and other crutches. I would still use the wire, but for some reason, downloading from the phone via the wire is almost always interrupted by errors. I don’t know what’s wrong there, but I tried different cables, in short, it’s not an option ... Now I’m uploading to the cloud or sending a letter to myself, but this is not as convenient as direct access to memory from a computer.

Answer 1

I don't understand what the problem is.
Take a router with wifi, connect computers to it via cable, and phones via wifi.
Now all devices on the same network and have IP+ should be pinged.
Choose any ftp server for android and install from the market (there are really a lot of them)
On another device, go to the IP: port specified in the program and download what you want

Answer 2

Why don't you like google drive? You can configure android so that it automatically sends all the files there. And other computers were already pulling them up.
In general, you need a separate file server to which all computers and phones will refer.

Answer 3

If you need access occasionally and under the control of the owner of the phone, then use Airdroid on it, for example.