Hello. My name is***** can assist you with your question.
The first thing that you'll need is the camera control software for Sony camera
You can download Remote Camera Control for Windows at: www.sony.co.jp/imsoft/Win/You can download Remote Camera Control for Mac at: www.sony.co.jp/imsoft/Mac/
Then set up the camera to connect as a remote-controlled camera in the USB settings
Set your camera’s USB Connection to PC Remote ModeSelect Menu > Setup Menu 4 > USB Connection > PC Remote.
2.Connect the micro USB cable supplied with your camera to the Multi-Terminal USB port on the side of the A7/A7R/A7S camera.
After that you should be able to connect. But if you're still having a problem or if his love questions, please let me know.
In order to do this directly from Lightroom requires that you use a camera supported by Lightroom. Your camera isn't on the list of supported cameras. You can see the list from Adobe here:
You are right that Lightroom supports tethered capturing, but only with specific cameras.