Laravel flysystem ftpd adapter

I want to use the ftpd Adapter in Laravel to access a Synology NAS, which seems to need this specific adapter http://ift.tt/2mmX2cu, but I get the error

Driver [Ftpd] is not supported.

The file is there:

vendor/league/flysystem/src/Adapter/Ftpd.php

Do I have to register anything that I can use it?

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