Syncthing works well when devices can find each other (usually over mDNS) and are online simultaneously. After dealing with an entangled mess of introducers and

Syncthing works well when devices can find each other (usually over mDNS) and are online simultaneously. After dealing with an entangled mess of introducers and devices, I decided to setup an old phone running Syncthing-Fork as root (otherwise mDNS doesn't work on Android), use it as a central introducer and always-online file host, and put my shared files there. It works pretty well, but I still run into cases sometimes where one client learns of the existence of files from another device, but the other device is offline and my central server doesn't have copies of them. For locally shared documents, I sync them with Syncthing and edit them on Android in Markor, and it works pretty well.