Gmail mobile app is one of the biggest mobile app in the world.in this app you can easily send your document and many data to one friends and many your friends in one time.i like gmail app because I use this app daily. This app is user friendly app and all the users use this.this app is full safe and secure and your data and your document also safe and secure in this app. Features of gmail app is very interesting and good.this app automatically send unwanted messages to your spam box.this is one of the best feature of this app.great , good and best app.thankyou