Walgreens is adding features to its application to take advantage of photo printing spurred by mobile camera use, Lauren Johnson writes. More than 40% of the chain's photo printing orders stem from mobile cameras, up from 15% in 2012. One new feature adds photo collage designs that permit users to pick card templates and customize them to personal taste. "Overall, we've found that users desire convenience-based functionality," Walgreens' Mai Lee Ua says.

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