I am unable to download my photos from my iPhone to my iMac. iPhone is running iOS 13.4 and my 2009 iMac is running El Capitan 10.11.6. When the phone is plugged in photos will open on the iMac and I ask to import photos (it's the same whether I ask to import all photos or just a selection) and nothing happens. I have restarted photos, the computer, the phone… all to no avail. Should I delete the photos app on the computer and see what happens if I reload it? Is my iMac simply too old to run the new version of photos?