Set up Photos for Assistive Access on iPhone
A person using Assistive Access on iPhone can use the Photos app 
to view photos, videos, and selfies captured in the Camera app 
, as well as pictures and videos from shared albums. You can add and customize the Photos app when you set up Assistive Access, or anytime after.
Add the Photos app
Exit Assistive Access if it’s active.
Go to Settings
> Accessibility > Assistive Access.Tap Manage Apps, then tap
next to Photos.To show pictures and videos in the Photos app from albums that are shared with the person using Assistive Access, turn on Include Shared Albums, then select the Shared Albums to include, or create one. See the Apple Support article How to use Shared Albums in Photos on your iPhone, iPad, and Mac.