iPhone 11 not recognize on High Sierra

Hi experts,

I'm turning to you to help me out with this problem I have been enduring for the last year...

Ever since I changed my phone to iphone 11 (iOS 14.6), when I plug it with lightning to usb in my Imac 27" late 2012 (on High Sierra), the iMac doesn't see it. I used to plug my iphone and back it up and use Image capture to transfer my photos and videos. Image capture doesn't see the iphone either...

I also have a MacBook Pro around the same age and it doesn't work either. It's probably something of an incompatibility between High Sierra and the iOS but I couldn't find a post that would explain it to me.

So any ideas what the problem is, and how can I transfer my photos and videos to my computer where I am used to manage everything? Airdrop doesn't work either. I know I should upgrade my PC but I have professional software I use that is not yet supported on M1 chip so I'm in limbo. Thanks in advance for reading all this! Take care!