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From your title it would seem you are trying to share the home share via sftp prior to changing it’s user to non root. But for the system pool shares of home and root (latter removed in later Rockstor) this may be a problem. I would advise that you create a share on your data pool (non system drive pool) and give it a non root owner and then share that via SFTP. Take a look at the following doc section on SFTP and it’s peculiarities re non root ownership:
The tool tip that appears when hovering over the edit icon states “Edit share compression setting”. I wanted to edit the access permissions, but this tool tip sounded like something else. For a while, I looked for a general edit button or something specific to permissions. Eventually, I clicked on the compression setting edit icon, since it was the only one there, and then I found the access control tab. Just mentioning this for anyone else who might be hesitating based on the tool tip (perhaps I am the only one).