Moving content from Windows to Linux/Nginx is simple and quick with the use of SFTP.
I used WinSCP to connect to Ubuntu and transfer files to be hosted by Nginx.
WinSCP can be downloaded for free from: https://winscp.net/
When first connecting you will have access to the Ubuntu users home directory. If you want to upload files to the website’s directory you will need to update some permissions.
Change directory owner & group to www-data
sudo chown www-data:www-data /var/www/{your_website}
Allow the group to write to the directory
sudo chmod -R 775 /var/www
Add your SFTP user to the group www-data.
sudo usermod -a -G www-data {your_username}
If you were already logged into SFTP, log off and in again.