The phrase "tag photos" refers to the act of labeling or identifying people or things in a picture.
Sentences with «tag photos»
It includes a range of standard features such as GPS connectivity to tag your photos with your location information, flash settings, a timer and quality settings. (techradar.com)
We take, share, and tag photos on social media. (pspca.org)
Tagged photos of your date: photos of your date, especially with their friends, often paint 1000 words about their personality. (uk.match.com)