Want to sync data (music) to sdcard on Android 7.0
If you really want to keep the entire directory (and possibly its sub-directories) in sync, so that their content is "mirrored", FolderSync would be a good candidate. It's an app running on your Android device that can communicate with a plethora of protocols:

  
FolderSync Screenshots (click images for larger variants)

As you can see in the first screenshot, it not only supports many clouds and FTP, but also Samba/CIFS (Windows PC, second from bottom). SSH can be used as well (that's how I use it with my Linux machines). FolderSync also allows you to schedule syncs, even limit that to when you're connected to your home WiFi. The paid version also has tasker support.

I'm not affiliated with the product or company, but I'm using the paid version happily for years on multiple devices :)