On Android (possibly only Android, unfortunately) there's an app called "Share via HTTP" in the fdroid repositories. Basically if your devices are on the same L

On Android (possibly only Android, unfortunately) there's an app called "Share via HTTP" in the fdroid repositories. Basically if your devices are on the same LAN, you can get the file off your phone, either with an IP/port combination, or a QR code. Obviously it would be nice if there were a desktop equivalent so you could go the other way, but this app has really made things a lot easier for me to move files around.