Just got an iPhone 17, fully updated to 27.2. I can connect it, with a cable, to my iMac (running 12.7.6) and the phone asks be to trust it and I allow that. Photos and Image Capture on my Mac can see it and import photos. However, the phone doesn't show up in Finder so I can't back it up or sync it. My iPhone 13, also on 27.2, works fine.
Any ideas?