I think this might vary from user to user, depending on any non apple photo app that allows access to your photos. I feel this was a lousy way to go through these steps, as apple does not have a solid fix to this issue yet. If you have dropbox, I suggest closing the app from your iMac as well. Update Your Mac And iPhoto App. This is the first thing you should try to do. Outdated software.

Photos is where all the amazing photos you take with your iPhone and iPad live. And now it’s even smarter and more personal, with intelligent new features that help you find, edit, and share your best shots.

Update Photos App On Mac

A lifetime of photos.
Curated just for you.

Get a beautiful look at every day, month, and year.

The Photos tab helps you find and relive your favorite photos and videos. Years highlights the best of your past photos. Months presents your photos by significant events. Days surfaces your best shots. And All Photos displays your photos and videos in a beautiful grid.

Intelligent curation puts the focus on your best shots.

Using on‑device machine learning, the Photos tab hides similar photos and reduces clutter by removing screenshots and receipts, so you can easily enjoy your best shots. Photos also uses intelligence to find and focus on only the best part of your photo for better previews.

Rediscover magical moments from your library.

The For You tab contains all your Memories, Shared Album activity, and the best moments from your library. You’ll get intelligent suggestions about which photos could look even better with effects. Memories intelligently searches and curates your photos and videos to find trips, holidays, people, pets, and more, then presents them in beautiful collections. Memories also finds your best photos and videos and stitches them together into a Memory Movie — complete with theme music, titles, and cinematic transitions — that you can edit and share.

Powerful tools for fine‑tuning
your photos and videos.

Make your best shots even better
on iPhone and iPad.

A streamlined editing experience lets you fine‑tune your photos with powerful new tools and better control over effects. You control the intensity of Auto Enhance, so when you turn the dial up or down you’ll see other adjustments — including exposure, contrast, and brightness — intelligently change with it.

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The photo editing tools you love.
Now for videos, too.

Nearly every tool and effect available for photos can be used on videos, including Rotate, Crop, and Auto Enhance.

Edit RAW images right inside Photos.

You can import and edit RAW images from Photos on iPhone or iPad models with an A9 chip or later.

Find your
favorite
moments
with ease.

Find photos by the things that appear in them.

Using advanced machine learning, scene and object recognition lets you search your photos for things like motorcycles, trees, or apples. You can also combine multiple search terms — like “beach” and “selfies” — without having to tap each word in search.

Picture all the ways
to share.

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Get smart suggestions for your most shareable photos.

The For You tab shows you great moments from your library, like family vacations and weddings, and uses face recognition to identify and suggest sharing photos with the people in them.

Bring your photos into the conversation.

Get suggestions for photos to share right in Messages based on who you’re chatting with, what you’re talking about, and where you’ve taken photos together.

iCloud Photos

All your photos,
on all
your devices.

With iCloud Photos, you have the freedom to access every photo and video in your library — from any device, anytime you want. So you can view a photo from last week or last year no matter where you are. iCloud Photos keeps every photo and video you take all in one place, and you can access them from your iPhone, iPad, iPod touch, and Mac, on iCloud.com, and even with your PC.

Designed to keep
your photos private.

One of the best things about Photos is how it protects your privacy. iOS and iPadOS are designed to take advantage of the powerful processor built into every iPhone and iPad. So when you search your photos, for instance, all the face recognition and scene and object detection are done completely on your device. Which means your photos are yours and yours alone.

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Resources

Take and edit photos with your iPhone, iPad, and iPod touch

Photos App For Mac

Learn about
the technology behind Photos