With the exception of a brief mention in Google Play for Education, Mountain View's book platform was all but absent from its Google I/O presentation. Still, the service is getting updated with a significant new feature: user uploads. It hasn't rolled out to all users yet, but those with access are now able to add up to 1,000 PDF and EPUB files to their Google Play online library. Both the Android and iOS versions of the app will be able to read these files starting today. The update brings a standard assortment of stability and performance improvements too, and Android users will see a few minor visual tweaks. Check out the source link below to see if the feature has rolled out to your account, or click here to peek at Google's biggest I/O announcements.