I take all my photos with iPhone and DSLR. All photos move to my iPad/Mac over iCloud synchronizing or importing (Lightning SD Card). This works very well. As a next step, i tag the best pictures as "favorites". But how to delete all the untagged "non-favorite" photos? In the iOS Photos App there is no filter or Smartalbum to separate and delete those pics. on OSX Photos i can separate "non-favorite" photos with smartalbum, but i cannot delete them. I moved from Adobe Lightroom where this was very easy. I'am interested in any hint or a better workflow. or third party apps. thank you.