Basically What I'm looking for is a software/ program / anything that can help me achieve the following objective :
I have a folder that is full of PDFs and I have multiple devices ( Android and Windows devices ) where I use these files but I have to copy a file to all of my devices whenever I make an edit to a file on one of my devices. So I want to synchronise these devices but without using internet as all of my devices that I use are usually at my home and I don't need to access my files when I am outside. Therefore I don't prefer cloud services like Dropbox or OneDrive.
So is there anyway to sync a folder on multiple devices ( cross platform ) using a local network such as the Wi-Fi Hotspot ( or maybe Bluetooth ) of my mobile devices, so that whenever I connect my devices to a single Hotspot then all the edits that I made in anyone of the devices get synchronised across all of my devices without consuming my Internet data pack ?