Task: I want to use the show app to share a madison presentation file with my mother Bianca.Rossi1967@gmail.com
Steps:
click on the untitled presentation at the upper left side of the screen to share a file
click on share icon at the upper right corner of the screen to send presentation file
choose download presentation option from pop up window at the bottom of the screen
click ok button on the pop up window at the center of the screen 
click on share button on pop up at the screen to send a file
click on share button on pop up at the screen to send a file
choose  ( gmail )first option from pop up window at the bottom of the screen
type Bianca.Rossi1967@gmail.com in top second column ( TO ) to share a  presentation file 
click on send icon at the top of the screen to share a presentation file