SFTP Storage - robinrodricks/FluentStorage GitHub Wiki
To use this, you need to reference 
The provider respects folder structure of the remote SFTP share.
You can instantiate it either by using a simple helper method accepting the most basic parameters, like hostname, port, username and password, however for custom scenarios you can always construct your own instance of SftpClient from the SSH.NET library and pass it to FluentStorage to manage:
IBlobStorage storage = StorageFactory.Blobs.Sftp("myhost.com", "username", "password");
// With a custom port and a private key file
IBlobStorage storage = StorageFactory.Blobs.Sftp("myhost.com", 2222, "username", new PrivateKeyFile("filename"));
// With both password and public-key authentication as an example, real world scenarios may need extra customisations
var connectionInfo = new ConnectionInfo("sftp.foo.com", "guest", new PasswordAuthenticationMethod("guest", "pwd"), new PrivateKeyAuthenticationMethod("rsa.key"));
IBlobStorage storage = StorageFactory.Blobs.Sftp(connectionInfo);To create from connection string, first register the module when your program starts by calling StorageFactory.Modules.UseSftpStorage(); then use the following connections tring:
IBlobStorage storage = StorageFactory.Blobs.FromConnectionString("sftp://host=hostname;user=username;password=password");