Task: My friend Marco asked me for the file My Doc, so I'd like to send it to him over gmail at marco.rossi@rossoday.com.
Steps:
click on the three dots icon of MY Doc file 
click on the Share option
enter the receiver email id marco.rossi@rossoday.com
click on the send icon at the top right side of the screen
click on the send icon at the top right side of the screen