Photos from iPhone 12 mini not showing in "Photos" on iMac (late 2009)
I have an old iMac (late 2009, Sierra 10.12.6, won't update to higher versions). Since I bought my new iPhone 12 mini, the Photos app is not recognizing the photos from iPhone anymore. The phone is showing up in Photos, but the app recognizes only photos from WhatsApp, screenshots etc., but not the actual photos I take every day. Seems to be a data format issue.
iCloud is enabled, all my photos from iPhone show on my iPad. I tried several things, e.g. the proposed solution by turingtest2 with using the MobileDeviceUpdater, but clicking this app on iMac does nothing (no reaction). Any ideas? Thanks a lot in advance.
iPhone 12 mini is also not recognized in Finder.