Import from card problems when iPhone plugged in.

This is totally off the wall. And there are probably users, experts, etc. who will tell you NOT to do this. But I have Lightroom (for the cloud) installed on my computer along with Lightroom Classic. I don't use it for editing. However, I have it synchronized with Classic. I also have Lightroom installed on my iPhone. When I take a picture with my iPhone, I have Lightroom configured to automatically pick up images from my camera roll. And as soon as I go to my computer the images are in Lightroom and subsequently Lightroom Classic. I don't have to connect the phone to the computer at all. Works for me. I don't take a lot of pictures with my phone. It isn't necessary to automatically send camera roll pictures to Lightroom and consequently to the computer, but that's the way I do. The other option is to selectively add from the camera roll.

Since you are using Lightroom Classic, you are also entitled to install Lightroom for the cloud. It takes a while to get your head around that concept and maybe you don't want to do it. If it confuses you at all then DON'T even consider it. It took a couple of years for my workflow to sinking. But then I'm an old buzzard anyway.