If you’re on a Mac and you want to send your finished images from Lightroom (or Capture One) to Apple Photos, to sync to your devices for example, then you can do it manually by exporting from one application and importing into the other. This can be a bit tedious, but there are also some ways you can automate the process. This involves exporting to a folder in the finder from Lightroom or capture One, and having that automatically import into Photos.