I keep getting a exclamation mark from my mac when opening up new pictures the picture come from my iPhone

Hi there, Melissa2812.

It appears that the photos you've transferred from your iPhone to your Mac are showing an exclamation mark, and we're glad to help with this.

Get help with the Photos app on your Mac - Apple Support -- Before beginning, make sure you have a backup of your Photos Library. Then work through the steps provided that apply to your situation. We recommend "Make sure that your software is up to date" and "If you're having other issues with Photos” sections.

Let us know how that goes.

Take care.