"is it possible to import runbooks from Orchestrator 2012 SP1 to 2019 latest version?"
Basically: yes it is. You just have to take care all related integration packs of SCORCH 2012 SP1 are available and imported in SCORCH 2019 as well.
"another question, does Orchestrator 2019 natively support SFTP/FTPS ?"
There is an FTP integration pack available. But there is a limitation related to SFTP:
In the Transfer Type (FTP) box, click the … button and select a transfer type. This configuration property applies to FTP only. This property can be left empty when the connection type is SSH File Transfer Protocol (SFTP).
Note: Orchestrator does not support SFTP on computers that run Windows.
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Regards
Andreas Baumgarten