Courtesy of @B.Diddy 'Welcome to Android Central! It's a system app related to your stock Gallery app. If you delete the data, it will likely just build up again the next time you open Gallery.
Search function has many answers.
Welcome to Android Central! It's just the stock Gallery app, which often has access to your Google Photos in the cloud. In order to access them, it has to ping the web and your Google account. Don't worry about it.