
Within the new Photos app in iOS 10, there's a tab called "Memories," which curates various photos and videos you've taken in the past into specific memory collections. Without any steps required on your part, Memories gives you an automatic homemade movie from these past family gatherings or vacations, but thanks to a few editing tools, you can also tweak each memory to your liking (note all steps are in portrait mode, although landscape is available).
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Navigate to Photos to find the new "Memories" tab in the center of the app, where you can scroll through your personally curated list of memories and choose whichever one you wish to edit and share. Within each detailed memory view, you'll find a list of all the photos and videos contained in the memory (tap "Show all" to see more than a summary), the geographic location the pictures were taken, nearby photos, and related memories you might be interested in.

A few examples of Memories in the new Photos app
The last two options at the very bottom let you favorite the memory or delete it permanently. Although the "Select" option on this page might seem like an option to remove photos only from this memory, it should be noted that deleting any content through this method will delete it from your iPhone and iCloud Photo Library, not only the memory. Jump to the instructions for "complex memory editing" below to discover how to delete photos and videos only from the memory, as well as add more.
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Article Link: Photos in iOS 10: How to Edit Memories