My iMac no longer recognises my Canon camera
My iPhone camera is so good that I've not used my Canon EOS 450D camera for a year. Today I used it and failed to upload my photos onto my iMac (running Catalina, version 10.15.7). However I was able to upload the photos onto my old iMac (running Sierra, version 10.12.6). Why has my new iMac stopped recognising my camera?