How to move files(including apps) to an adopted sd card directly from PC?
So your SD card has a certain format. This allows it to be used for apps, but the downside is your Windows doesn't see it. In theory a good driver should present the SD card over MTP, but that's wishful thinking. 

The best way to access your SD is via adb. Install adb on Windows and push your files over USB. This requires typed commands in a shell. 

You might also be able to see your SD when connecting your phone to a Linux system.