I'm not a Mac guy, but if I remeber correctly this happens when you haven't set the Library folders to be visible and the folder gets hidden from al lapss. The solution apaprently is to search for it in Finder, check the file info on the parent Library folder and turn off the obfuscation. otherwise I'm not sure what could be going on, but it's perhaps worth a try.
how to save images to 'photos' ? this was an option recently but seems to have dissappeard . . useful for a quick lo res reference and instagram ready file
Are you asking about the Add to Photos option on the old Quick Share menu on the options bar (see picture below)? If you are, unfortunately Adobe removed that entire menu in version 23.3. If you want to add a Photoshop document to Apple Photos, now you have to manually export it from Photoshop and then manually add it to Photos.