Lightroom's FTP module doesn't handle SFTP like a standard FTP application. If your server required SFTP then you might receive a notice about SSH while setting up a new publishing service. Simply push the Accept Key button to continue.
If you receive an error like this processing error below, it is likely caused by entering the incorrect website address in the publishing server settings. For example, if your domain is www.myphotos.com, be sure to enter it exactly like that when creating the publishing service. leaving the www out will cause the error. The same goes for http or https.
So if your website is https://www.domain.com then the URL should match in Lightroom.
If you find yourself being completely blocked from publishing new galleries, albums or images, it's possible there is an additional security measure in place. We built our Lightroom to prevent being blocked by XML-RPC, which is a common roadblock on many hosts. However, if you are using a security plugin, like iThemes Security or SecuPress, there is a greater chance of Lightroom publishing being blocked. Try temporarily disabling the security plugin to see if it helps. If it doesn't, please contact support for further troubleshooting.
If you find the plugin not working at all, and you're on a Mac, it is possible that you're not running the latest version of MacOS. At the time of initial release of our Lightroom plugin the MacOS version is 10.12.2. If you're using anything older than the latest version it is possible the Lightroom plugin will not work. We will not be supporting outdated versions of MacOS.
The Lightroom plugin only supports the latest versions of the standard and Creative Cloud.