USBs aren’t convenient enough. I’ve done wifi sharing via FTP, which didnt require WAN. Ftp was slow to set up. My bluetooth’s bandwidth seems very small?
A 1 click to install app across multiple devices, that only uses LAN, would be ideal. Right now, I just transfer files with element
The simplest to use is O&O File Direct, it very easy to use and encrypted end2end. But the problem is, it is not FOSS (Freeware) and only for Windows. Sad. I have put it just in case it is useful to someone despite this, because it is really good and safe.