I’m unable to get “open in external editor” working on Mac OS.
I’ve tried switching “Adobe Photoshop Installation Directory” in settings to the Applications folder and the Photoshop folder in my Applications directory.
When clicking the “open in external editor” button, it creates a TIFF image, but that image never ends up opening.
You need to give the full path to the binary within the Photoshop application bundle. And if there’s any space character in the path, you need to put the path between quotes.