Generate a public/private key pair

SFTPCloud supports authentication via private keys. If you don't have a public/private key pair, you will need to generate one.
SFTPCloud has support for ECDSA keys. In order to generate your pair, run the following command. You must not use a passphrase (leave it empty).
ssh-keygen -t ecdsa -b 256 -C "My SFTPCloud key"
This will generate two files: id_ecdsa and id_ecdsa.pub . The id_ecdsa.pub file has to be added to the profile of the SFTP user and id_ecdsa will be used by the SFTP user when logging in.
Here you can find more details about how to add the public key to the user profile.