MacBook Pro is not supported by iPhone 12 Max Pro??? All are updated! They paired just fine. But they will not connect. iPhone gives the message that MacPro is not supported????

Bluetooth pairing an iPhone and any computer is not supported.

An iPhone will not pair via Bluetooth to a computer (Mac or Windows) or an iPad except for personal hotspot and then only if your cellular plan supports it. See the following for more information: Bluetooth: Why can't I pair my iPhone or … - Apple Community

If you are attempting to use Handoff/Continuity or AirDrop, that does involve Bluetooth but the devices are NOT paired; Bluetooth just needs to be on and the devices in range of each other. The following may help with Handoff/Continuity issues: Use Continuity to connect your Mac, iPhone, iPad, iPod touch, and Apple Watch - Apple Support

Also see Share files between your Mac and Bluetooth devices - Apple Support

Ok, as it hasn’t become clear to you yet, YOU CANNOT CONNECT AN IPHONE TO ANY COMPUTER USING BLUETOOTH. But there is also no need to. So FORGET Bluetooth, don’t tap on Bluetooth; it has nothing to do with connecting your phone to your Mac for any purpose.

There are several ways to transfer photos. Bluetooth is not one of them, AND NEVER HAS BEEN. Here are all the ways described→Copying personal photos and videos from iPhone, iPad, or iPod touch to your computer

I just played with my computer a bit and I can get the same error popup you get.

I think there must be some confusion because you can't exactly 'pair' your phone with your MacBook.

You must have initiated this 'pairing' from the Bluetooth menu on your MacBook. My iPhone was shown in the Devices list of my MacBook with the option to 'Connect', then I had to respond to the pairing request on my phone with a 6 digit code..

My MacBook is then listed in the iPhone's Bluetooth device list, showing as Not Connected. Tap it and I get the same pop up you posted.

All this aside, you can't transfer photos from your phone to your MacBook by being 'paired' with bluetooth. You'd connect your phone with a cable and then open the Photos app and select to import

Transfer photos and videos from your iPhone, iPad, or iPod touch to your Mac or PC - Apple Support

Your previous computer.. were you using iCloud photos, where you'd see the pictures from your phone automatically appear in the Photos app? Do you pay for additional iCloud storage?

Set up and use iCloud Photos - Apple Support

you might be better served with a cable that has the correct ends rather than an adapter.. But either way works

The iPhone 12 would have come with a USB C to lightning cable, so I assume that your MacBook does not have any USB C ports.. Probably has USB A ports?

Here is one that Apple sells.. or if you have the cable from your old iPhone, that should still work for you.

Lightning to USB Cable (1 m)

Anker also has plenty of options..

https://www.anker.com/products/a8812?variant=37438276403350

ok, just saw your comment above that says your laptop is a week old..

So you have a newer MacBook now and it has USB C ports.. and an iPhone 12 Pro Max

USB type C is much smaller than USB type A.. & USB C you can rotate 180 degrees and it still works

I believe the iPhone 12 lineup all came with USB C to Lightning cables.. Are you using the cable that came with the phone? Or are you using an old cable from a prior iPhone.. Maybe the new cable is still in the iPhone box somewhere?

In any case, here is the only other style of cable that you'd need if the first ones I sent are not right...

USB-C to Lightning Cable (1 m)

or Anker again

https://www.anker.com/products/a8633?variant=40405244543126

ahh, so you bought a USB C to USB A adapter from Apple..

If that's hard for you to use, I would suggest getting one of the cable's I mentioned, or digging around to see if you still have the cable that came with your iPhone 12 Pro Max.

previously you indicated that plugging the cable into the adapter was the challenge.. but what you're showing is the direct connection to the computer.

It might be worth noting, that USB C can require a little extra push to get it fully inserted. And yes, the ports are pretty close together on the Macbooks. I am not sure what to tell you on that one.

Do you mostly leave your MacBook at a desk? Or do you move it around the house?

If you mostly just leave it at a desk, then maybe consider leaving the cable plugged in all the time. Then when you want to connect your phone, just plug the lightning connector into your phone..

If you unplug the cable because you need it elsewhere, then consider getting a new cable so that you can leave one plugged into the computer along with the charger?

image is my setup.. I always have that cable plugged in and coiled off to the side. For me it’s mostly cause I’m lazy, but for you it might make life easier

I don't understand what it is that you are trying to accomplish (or why the devices are connected via a cable).

You can use the old cable; it is compatible.