Automator "Add to Album" error This Automator workflow worked in Sierra, but it fails in High Sierra with the error, "The chosen receiving album does not exist in the Photos library: ".  The album does exist, and the dropdown list shows all my existing albums.  In the error message, there is no text after the colon, so it seems to be trying to add to blank-named album.
This is actually a use case for the "Import Files into Photos" action if the images are coming from outside of Photos.