Q: Why do just some of the pictures I take with my iPhone get automatically transferred to my MacPro and some do not?

Hey dotsby,

Thanks for the question. If I understand correctly, you are using My Photo Stream to get photos taken with the iPhone to go to other devices. I would recommend that you read these articles, they may be helpful in troubleshooting your issue.

iCloud: Set up My Photo Stream

new photos taken with your iOS device are uploaded to iCloud when your device is connected to the Internet via Wi-Fi.

Get help using My Photo Stream - Apple Support

Thanks for using Apple Support Communities.

Have a good one,

Mario