@Matthew_S: On Windows, “Add to Insync” is not available in following scenarios:
- Your main Insync folder is set up on a network drive or an external drive.
- For files on Windows XP/Server 2003
- For files & folders on external/network drive on Windows XP/Server 2003
Kindly send to us the Insync logs so that we could confirm why it is not available for you.
Thanks