Thank you for posting your query on Microsoft Community. Let me assist you.
Provide us with the below details for better clarity on the issue.
1.Are you referring to Photos App or Windows 10 Photo Gallery?
2.Are you facing any issue viewing pictures?
Windows 10
Photo Gallery gets updated by Windows Updates automatically. To install any latest Windows Updates available, follow the steps.
1.Go to
Start and then Settings.
2.Click on
Update and Recovery.
3.Check for updates under
Windows Updates.
4.Restart the system.
On the other hand, Windows 10
Photos App can be manually updated from the Windows Store. Refer the article for steps to update the apps from the Store.