FileZilla
FileZilla supports connecting via SSH key and One Time Password (OTP).
Generate SSH Key Pair
You will need to generate a SSH key pair (private key and public key) on your computer. The private key will be stored on your computer while you save the public key in your home folder in the NMRbox server that you are connecting to.
Windows
To set the key, go to Edit -> Settings and select SFTP. Click Add key file... and add your private ssh key.
Mac OS X
To set the key, go to FileZilla -> Settings and select SFTP. Click Add key file... and add your private ssh key.
Set site to Interactive Logon
Go to File -> Site Manager and add new site.
Use SFTP for protocol, the name of the host you want to use, Logon Type: Interactive, and add your NMRhub username. Press OK to save settings.
Connect with OTP
When ready to connect, open Site Manager again and press Connect.
Enter the current OTP generated in your Authenticator app in real time.