How create a local network on Android?

I want to create a network where my phone is the server, other phones can connect to my phone, and all of them can read or write on *a specific folder*, not all of my internal storage. Recently, I was trying to use SSH (using Termux). I searched and asked about it on [Server Fault](https://serverfault.com) . So, I could not find a way to use that. Is there any other way? I don't know if I can do this with SSH or any other protocol. (I use Termux, and if there is any way that needs Linux, I will thank you for sharing it with me.) I don't have a computer, so I prefer solutions without requiring it. I am ready to do it the hard way because it's the only possible way for me. Thank you. Edit: my phone is Xiaomi Redmi 10. 128GB with 4GB RAM.