If you have an Android Smartphone and are looking for a simple, but an effective app for sharing files between your Android device and computer or any other devices, SwiFTP might be the right choice.
SwiFTP is an open-source, free and simple to use FTP server application that enables Android users to stay connected with other computer and devices via WiFi network. You can transfer music, documents, videos and other files using a secure FTP connection.
Once installation and settings are completed, your Android phone can be accessed from a computer or any devices using any popular FTP client.
Moreover, if your Android device is behind a firewall and NAT device, SwiFTP will still work by routing the traffic through some proxy servers, but, remember, these proxy servers aren’t free.