Hello bwpratt,
Thank you for using Apple Support Communities! I understand that not all of the photos and videos on your iPhone XR will import to your iMac. Preserving your memories is important, and you've come to the right place for help.
I'd like to start by ensuring that you're following the steps under the "Import to your Mac" section in the support article below:
Transfer photos and videos from your iPhone, iPad, or iPod touch - Apple Support
This section in particular provides additional information to be aware of when transferring photos from your iPhone, and troubleshooting steps to try when it's not working as expected:
"In macOS High Sierra or later, imported photos appear in the Photos app's Import album. If you're using an earlier version of macOS, you'll find them in your Last Import album.
Photos and videos that you sync from your computer to your iPhone, iPad, or iPod touch using iTunes can't be imported back to your computer.
Learn what to do if you can't import photos from your iPhone, iPad, or iPod touch to your computer."
If you're still experiencing the issue after trying those steps, could you provide further detail? Here are some questions that could be helpful to answer:
- What macOS and iOS version are you currently running?
- How were the photos and videos originally added to the iPhone? Captured using the built-in Camera app on the iPhone, downloaded from another source, or synced from a computer?
- Do the photos and videos fail to import with an error? If so, what does it say?
Cheers!