Many moons ago, Google added G+ photo backups, a feature that not only keeps pictures backed up with users' Google accounts for safe-keeping, but also allows for quick and easy sharing on Google's social network. Today, the company is offering similarly simplistic sharing of photos with Gmail in the web browser.
As of today, the Gmail web app's "insert photo" button within the compose window's action bar will have access to the photos that are automatically backed up via the Google+ app on smartphones and tablets. If images are organized into albums on Google Photos, then it's even possible to easily share groups of pictures simultaneously. Aside from that, images can now be resized within the compose window by dragging on any corner.
This feature should be rolling out to users beginning today.