It can be used similarly as a lite version of KDE Connect, but KDE Connect is for pairing a dedicated device to your PC. This will allow sharing between phones on the same network as well, and allows easier use for usecases like quickly sharing a file to your friend who has their phone connected to your wifi, without making a permanent pairing of the devices.
You could do the same with KDE Connect but you have to set it up on your friends device and allow permissions and all that. With this, you just choose the files and send, and it can work over a link you send instead if the other person doesn’t want to install the app. This is a much simpler version for one-time file transfers and for devices not owned by you/not trusted.